1. Her phone is completely off limits
2. She takes more of an interest in her appearance
3. Makes plans with friends you've not heard of
4. Is unusually happy and excited
5. Comes home late from work and difficult to contact
6. Conceals her feelings
7. Is sarcastic towards your relationship
8. Loss of interest/affection in you
9. Flirts with more men – including your friends
10. Loss of sexual appetite
If you have found at least three of these signs then we have bad news for you. But do not jump to conclusions, you should remember that women have changeable nature that does not neccessary indicate your partner's infidelity.