She pays increased attention to her appearance

Women involved in new relationships often become preoccupied with their looks. According to AskMen.com, it is a sign that your girlfriend is cheating when she suddenly changes hairstyles, starts wearing a new perfume, buys new clothes (particularly lingerie) and starts working out more at the gym. Assuming that she hasn’t started a new job or had some other big change in her life, take these changes as signs.

She engages in secretive behavoir

Cheating girlfriends often become very guarded and cagey. Dr. Reena Sommer, a divorce and affair consultant and author of the book “The Anatomy of An Affair,” observes that when cheating mates are working on a computer, they are often quick to close or change a program window whenever you approach. Similarly, Dr. Robert Huizenga, an infidelity coach quoted in an article on Womansdivorce.com, says that a cheating girlfriend may begin to delete emails from her email inbox, where before she let them accumulate. A cheating girlfriend may suddenly start taking her ringing cell phone into another room before answering it, and then delete the caller ID number once she’s finished the call.

She becomes vague about her whereabouts

Dr. Sommer notes that it is common for unfaithful mates to be evasive about their whereabouts and activities. If your girlfriend suddenly has difficulty giving a straight answer about where she was or what she was doing during the day, it may be a sign that she’s cheating on you.

She frequently talks about a certain new male friend

Sometimes a friend is just a friend, but if your girlfriend speaks of one new male friend more than any other, it may be that she is having an affair with him. CatchingThemCheat.com notes that even if this friendship is something she admits to openly, it is still a relationship of which you should be wary. You should be particularly suspicious if you never met this friend. AskMen.com warns you to be concerned if she suddenly never mentions the friend again after talking about him constantly.

She is increasingly argumentative and irritable

Cheating girlfriends may become highly argumentative, nit-picky and defensive. CatchingThemCheat.com warns that a girlfriend who starts arguing over little things or nothing may suggest that she is both cheating and looking for a way out of your relationship.

She is suddenly less interested in you

If your girlfriend seems to no longer care about spending time with you, or is less interested in your appearance, health and general well-being, it could be a sign of unfaithfulness. AskMen.com notes that cheating girlfriends often become less critical of their men, having found someone who does not have the same habits and qualities.

She is disinterested in sex

The amount of sex a couple has may decrease for many reasons, including busy schedules, depression, stress, and lack of novelty. However, infidelity may also be a major factor. SignsOfACheater.com observes that because emotional attachment is key to many women in their sexual relationships, some cheating girlfriends may exhibit less desire for their boyfriends because they feel emotionally removed from them.

She has started working lots of overtime

A classic sign of infidelity is when your girlfriend starts working more–a lot more. Dr. Sommer notes that this suspicious change in work schedule can manifest itself in different ways: leaving the house earlier to go to work; coming home later; or claiming to have many business dinners. But take note: is there a pattern to these extra working hours? Every Tuesday and Thursday, for example? If so, that may be a sign that something is wrong. Keep in mind that if the job is new or she has recently received a promotion, there is no need to immediately suspect that she is cheating.

She is less affectionate with you

Consider whether your girlfriend has stopped calling you by a special nickname, is less inclined to hug or kiss you, or respond enthusiastically to your affectionate overtures. According to MensSpot.com, a drop in affection may mean that someone else is dominating her thoughts.

She accuses you of cheating

A cheating girlfriend may try to deflect attention from herself by going on the offensive. Sabrina Summerfield of YourMarriageAngel.com says that if you have given her no reason to think that you’re cheating, and yet she frequently accuses you of playing around, then she may be the person who is unfaithful.

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Op-ed pieces and contributions are the opinions of the writers only and do not represent the opinions of Y!/YNaija.