Humans are not mind reader, image your wife, whom you love, you never hit her and never treat her wrong and is a good husband. And she screw around with some bad boy behind your back. (Because we know a lot of girls have a thing for bad boys [and that is probably why, so many women in western society been in abusive relationship, of course a bad boy is going to hit his girl friend.]) But, if you need to worried 24/7 thinking whether your wife is cheating on you, I think it is fair to say it is better to stay single. So, how do you know whether your wife is cheating on you?