1- She's no longer as needy
If she was never able to go shopping, exercise or cross the street alone, and she suddenly doesn't need your company, it may mean that someone else is filling your shoes.

2- She no longer gets angry
She used to get angry if you didn't want to meet her for lunch or come out with her and her friends, but now everything you do is all right by her.

3- She's being secretive
She's no longer sharing her daily events with you, and in order to find out what she's doing, you'd have to hack into her BlackBerry because she's not volunteering any information regarding the goings-on in her life.
4- She places the focus on you
When you do ask her questions, she turns the tables on you.

5- She showers you with pleasure
Now that it's all about you, your girlfriend is always complimenting you, asking you to go out, giving you "I love you" cards for no reason whatsoever, and even offering to wash your car and watch the boxing match with you.

6 Phone Calls
Has she been getting more private phone calls lately? Does she leave the room to talk on the phone more than before? When you ask her about a call, does her response seem genuine, or does it seem that she is not being truthful about who is on the other end?

7. Dates with Girlfriends
Is she spending more time with her girlfriends than in the past? Are there many evenings out with the girls, when there were almost none just a short while ago? When you ask her who she will be with, does her answer sound sincere?

8. Cologne
Does she ever smell of different cologne, one that is more masculine than hers? Do you ever comment on the new scent she is wearing, only to find that she does not apply the same scent at home?

9. Eye Contact
Has she stopped making eye contact when answering questions about where she has been and what she has been doing? Does she avoid looking you straight in the eye, when that was not an issue before?

10. Alcohol and Other Substances
Is she drinking outside the home at odd times (daytime) or more than before? Have you suspected drug use, where there was none before? Does she ever smell of cigarettes, even though she doesn’t smoke?

11. Sexual Deviations
Does she want sex less often than usual? Does she seem to just be going through the motions? Is she asking for things you never did before or teaching you new tricks?

12. She pays more attention to her appearance.
Women who start a new relationships often become obsessed with their looks. According to Top 10 List, it is almost certain that your girlfriend is cheating when she suddenly changes hairstyles, starts wearing new scents, buys new clothes (especially sexy lingerie) and starts working out more at the gym (never did before) Assuming that she hasn’t started a new job or had some other big change in her life, take these changes as signs.

13. She becomes vague about her whereabouts
Studies show that it is very common for unfaithful spouses to be very cold about their whereabouts and activities and will make up preposterous excuses to make up for it. If your girlfriend or wife suddenly has difficulty giving an answer about where she was or what she was doing during the day, it may be a sign that she’s seeing someone else.

14. She is more argumentative and irritable towards you.
IrritableCheating girlfriends or wives for that matter may become highly argumentative, nit-picky and defensive. Top 10 List warns that a girlfriend who starts arguing over the small, nitpicky things may suggest that she has been cheating and looking for a way out of your relationship.

15. She is not interested in having sex with you
The amount of sex a couple has may decrease for many reasons, including busy schedules, depression, stress, and lack of goodness in life. However, infidelity may also be a major factor. Studies show that because emotional attachment is the key for many women in their sexual relationships, some cheating girlfriends or wives may exhibit less desire for their men because they feel emotionally removed from them.

16. She keeps jealousy in check.
17. She develops a mysterious friend.
Peter Spalton, also known as ‘The Dating Doctor’, says that women who cheat will often create superficial friends to throw suspicious partners off course. He says: “You may find that she goes out with these friends regularly, maybe the same evening each week. She might even come up with a reason, maybe work or a hen party, so she can stay overnight.”

18. She becomes more secretive.
woman secretiveIf your partner becomes increasingly secretive out of the blue it’s one of the obvious signs she’s got something to hide. He says: ‘She has her phone on silent vibrate and carries it with her all the time. She gets up when you’re both watching television in the evening to go to the loo and takes her phone with her. She seems anxious and gets agitated if you ask her if everything is all right.

19. She has new and revealing clothes and new, hidden lingerie

20. She’s spending a lot of time on the computer. Many affairs begin on social networking sites or online dating sites. Open her browser and check which website she’s visited. If the history has been erased, that’s a red flag. Download and install monitoring software (keylogger) on her computer, which will make it easier for you to monitor your spouse’s activities.

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