it appears he is sincere about wanting your relationship as evidenced by his behavior in turning over all his passwords and answering your questions, but the fact that he hasn't stopped makes me believed he has an addiction. it is understandable how hurtful this is to you, how violated you feel. he needs treatment. he could get better, he may never get better. I think I could live with a man chatting it up with other women but not one actually having sex with other women. you have to decide what your boundaries are. take care.