I hate that i can't stay faithful?

If you were only experiencing these feelings while dating I could understand thinking that "you haven't found the right woman". However, given that this is obviously a continual and ongoing issue that has destoyed not only relationships but a marriage as well, there are obviously more serious issues going on. As to what is "wrong" with you... That's probably a question that needs to be taken up with a therapist. There may be some deep issues that you're unaware of. Perhaps therapy could help you discover and overcome whatever is holding you back from maintaining a loving and committed relationship.