Because of the lies he tells. You see, when we were separated the first time I found out about another woman when she sent pictures of herself and my H and letters H had written her to my work as proof of their relationship. He promised me then that if he was ever interested in another woman again he would just leave me and that's what he just did.
He won't admit it, however, as that would make him look like the bad guy and he can't stand that. Also, because he keeps insisting I have been interested in someone else....the guilty always make accusations.