Many people believe that a man will be caught cheating only if he returns home with a lipstick stained collar and dripping in another woman's perfume. This isn't always the case and often the real subtle signs a man is being unfaithful are often completely overlooked. You might find yourself expressing to your closest girl friends, "He's acting very strangely but I just can't quite put my finger on it."

In a report, which appeared on Medical Daily, a study from the University of Chicago had shown that 22 percent of married men and 15 percent of married women had cheated on their partners at least once. Most recently, the website Ashley Madison which allows married people to hook up online had been hacked and under threat of identity leaks. It sent a shiver of paranoia down the spines of many couples - could their own partner be named and shamed as having an account?

These following subtle signs are notable behaviour patterns belonging to those who have been unfaithful. However, this doesn't necessarily mean that you have your very own Tiger Woods on your hands and need to get a divorce lawyer on the phone. Instead these behaviours work as a guideline which could only potentially signal infidelity.

15 There Are Obvious Changes To His Whole Routine

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When things are going well and all is happy in your relationship then you will both slip into a daily routine. You know what time each other will set the morning alarm, you both have dinner at a set time, and then after watching your favourite show together it's upstairs to the bedroom.

If all of a sudden there is a drastic change to your routine then it might be a warning sign of deeper issues. If he's skipping dinner each night and heading to bed earlier than usual, then you should subtly look into why these changes are happening. In short, he is falling out of sync with your life which is a sign that he may no longer want to be a part of it.

14 He Has Changed His Appearance Drastically 

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Has your partner lost almost a stone in a few weeks? Become so stylish you hardly recognize him anymore? Change can be a healthy, positive thing and most of us enjoy updating our look every few months or so. Unfortunately, when your partner is embarking on a new sexual affair they are rediscovering themselves and changing their look is all part of this.

No woman wants to feel as if some other woman is reaping the benefits of this new body confidence. So make it very clear that if they are putting all this effort in at the gym then there better only be one person who benefits from this - you.

13 Spending More Time On His Own Around The House  

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Is he locking himself away in the bathroom for "long baths" lasting around an hour? Is he spending more time in the garage instead of joining you for a night-in? When our partners are cheating they begin to emotionally withdraw and this explains all the extra "me" time.

Men can often find it too emotionally exhausting to invest in two relationships at once. Therefore he can only give his all to one woman at a time. He won't be able to multi-task by communicating with his bit on the side whilst sitting right next to you. Also, it might be a dead giveaway if he's on the phone with his new fling when you're on the couch next to him.

12  His Finances Are Now Completely Private

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Were you always completely open with each other and your spending? Now has he begun to keep all his bank statements under lock and key? When men begin dating they will usually be splashing out on meals, hotels, gifts and trips away. This doesn't necessarily mean that the other woman is an escort but he will try to impress her with his generosity.

Some men go to great lengths to hide irregular spending on their accounts. Some even open a new account just for the purpose of treating their affair. Trying to spend money whilst remaining untraceable is near enough impossible. Often opting for cash transactions only is the easiest way not to get caught.

11 All His Electronic Devices Are Well Hidden 

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When we socially interact with someone it is 9/10 through social media online. This does leave electronic traces from every conversation and men are more than aware of this. You might start to notice his phone on airplane mode more often, his passwords have all been changed, and he's no longer using that cute photo of you both on vacation as his profile picture.

Unfortunately, there are apps out there that are more than willing to help cheating partners. This technology allows text messages to be deleted and online chats to erase immediately after the message has been read. It's a high-tech world we live in nowadays so we all just have to be on our guard just that bit extra.

10 You Are Experiencing More Of His Mood Swings 

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Those who cheat on their partners are often quite cowardly. They don't wish to come forward honestly about certain issues in the relationship so instead they create them. When he begins to cause arguments by appearing hostile and agitated this is his passive-aggressive way of expressing that he is no longer happy.

Your partner will be more likely to justify an affair in their own heads if he believes things aren't going well between you. Which then leads him to encourage a difficult situation instead of avoiding one. Be honest with him, admit you are finding this behaviour unfair and try to seek out exactly what his true motives are.

9 He Has Accused You Of Cheating  

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It's strange but true that cheaters will actually accuse their own faithful partners of cheating. This is a manipulative trick that is often referred to as psychological projection. Author Corri D. Fetman explained in a Huffington Post article, "Psychological projection is a really strange human behaviour in which a person ascribes flaws to others that they deny possessing. As a result of this twisted reverse psychology, projection also happens to be a great indicator of cheating in a relationship."

Basically, if your partner uses this technique then they are being defensive. It's a tough one to deal with as trying to communicate with someone who's guard is already up is not an easy task.

8 Many Of His Belongings Have Started To Go Missing 

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When we are spending time outside of our comfort zone we can often find our things begin to become misplaced. If you notice your partner returning home without his favourite watch or with mismatched socks, then he might not have been exactly where he said he was.

If your partner is engaging in an affair, he will often find himself covering the much larger tracks and forget about his attention to detail. Even the slight whiff of perfume on his collar can make a woman go into full investigative mode.

7  He Explains His Nights Out In Full Detail 

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Your man will most likely cover his tracks when he's away by making out that he stayed with friends. On his return home his mind will be going crazy trying to figure out how he plans to get his story straight. Before he knows it he's written an entire screenplay of the night before and he's ready to play his part.

Eventually these lies will become a tangled web and he will eventually be caught out. If you feel your partner is lying to you, then leave it for a few days and return back to the same conversation to decide if there have been any drastic alterations to his own alibi.

6  Your Sex Life Is Non-Existent 

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Sex is a huge giveaway when you are investigating if your partner is cheating. A huge decline in your sex life is often a warning sign that they may be tending to their needs elsewhere. Although, professional and emotional problems can also leak havoc it is always cheating that comes up as the most probable explanation.

Dr. Jennifer Oikle is a psychologist, dating coach and founder of My Soulmate Solution. She explained in an interview with Woman's Day magazine, "If your spouse is never interested in having sex anymore, you should consider the possibility that he's having an affair. His mistress may be giving him something sexually that he isn't getting at home, or because it's secret and new, it's more exciting, so he puts all his energy into sex with her." It's a bitter pill to swallow but it could help to reveal the truth.

5 He Has New "Friends" That Have Appeared From Nowhere 

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When you first become an official item you can't help but show each other off to everyone. After spending more time together you will eventually get to know each other's friends and work colleagues. If all of a sudden he has new buddies that are taking up all his time, then the truth might be that they don't actually exist.

Most men have their friends cover for them by creating a story they can both sick to when you question his whereabouts. Then there are a few who go the extra mile and actually create an entirely fictional character. If you've heard too much, "Oh I was just hanging with Bob again", yet no social media has been linked - it's probably all a very weak alibi.

4 Cancelling Plans At The Last Moment 

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When your partner begins to engage in an affair, you are often not a top priority anymore and more likely to be dropped at the last moment. If suddenly they have something better to do rather than spend time with you then these are serious warning signs.

It is hard to hear, but when you have a partner tangled up in a secret relationship then they are more likely to align their schedule with their secret lover rather than you. His routine will start to become focused more around her than you. So all odd behaviour should be looked into, if not for cheating purposes to find out what the real issue is.

3 You Live Entirely Separate Lives

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Have you both started to become completely absent from each others lives? Often we don't get much time to spend with each other due to working long hours, having active social lives or family commitments.

If you do find yourself completely avoiding each other then you might have to become aware that perhaps your partner is taking advantage of this freedom. Always make sure you communicate with each other because distance can grow fast.

2 He Has A Clear Window Of Opportunity

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We have many relationships throughout our lives and sometimes these often form with colleagues. However, there are some people out there who struggle to respect professional boundaries and may take advantage of those who have a weakness for office flirtation. You might eventually become heartbroken down the line when you realize "she's just a friend" isn't really the whole truth.

There are certain events your partner might have to attend which also may have access to many beautiful women and the temptation will always be there. Make sure you are firm with your other half and explain exactly what behaviour you find acceptable.

1 He Has Cheated In The Past 

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According to the Medical Daily, a recent study published in the journal Evolution and Human Behavior disclosed that cheating behaviours could actually be in our DNA. Vasopressin, a hormone found in our genes, affects trust and empathy levels. This gene plays a crucial role in bonding and sexual motivation. Something nobody would want to hear is that their partner might be a natural born cheater.

Remember if you feel slightly awry or that things just aren't right then always listen to your own intuition. If he has deep-rooted confidence issues then he might find monogamy very difficult. Breaking up is never easy but it could save you a lot of pain in the long run.

Sources: womansday.comhuffingtonpost.com

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