hurt?

I've been with my husband for 10 years now,married for 6 years. when we started dating everything was good. Well, he cheated on me with not only one but lots of other girls. I found out about it and he confessed. We haven't spoken about this ever because he feels its in the past but I can't just leave it at that. I want to know what happened and what he did with these women. He says he never loved any of them but I find that hard to believe.I still feel hurt about this and the fact that he doesn't want to talk about it. It is getting in the way of me being 100% happy with him.I feel that he betrayed me in the worst way ever and can't forget so easily.  Please tell me what i have to do.