Why do married men cheat on their wives ?

That, he does not leave his family, does not mean that he gets his ual satisfaction with his wife. In other words; since he does not get satisfaction at home, he is looking for it outside of his marriage. Anyways, this is a general (or even b) situation, many men and women do this. Do not blame yourself for that you have got into this situation, but after you have got your own satisfaction you should step forward because you may be trapped seriously by this relationship.