Why would a husband cheat on his wife with his wife's sister?

There really is no perfect answer, but here's a couple of possibilities: There is something missing at home and feels that he needs to go elsewhere to get it or maybe he is an addict and can't control himself. People cheat for many reasons. What should happen before cheating occurs is a honest talk about the intentions of the one whom is not happy. Men who cheat alot of times cannot commit to one woman and think it is there duty as a man. Real men are not liars nor do they hurt the ones they love. A relationship that has this drama in it usually had issues before this happened that were not taken care of. Please remember that it is not you. The two of you married each other and are supposed to be honest, caring and considerate. If the relationship wasnt working for your husband as he invisioned it after marriage, he should have come to you and been a man and let you know before doing anything disparaging to the marriage. Now you must weigh your options , do you want to the relationship to improve, will you ever be able to trust him again and how will he earn your trust back. Move on with your life so you can enjoy your self and be happy with someone who will show you the respect you deserve. good luck. if you cheet on your husband than you realy neep theripy! WHISPERS: how stupid can you get!