I have been dating this women that has been off and on with her x husband,?

and I think she has been seeing other guys and poss. girls to. When she leaves with her husband and comes back she talks about "how good it was" knowing that it hurts me. Its like she is rubbing it in my face. She has dumped me more times than I can count. How can I tell her that I dont want to be with her any more and that I dont want to hear all that stuff? I would like to try to remain friends, so I dont want to come off as a b when I tell her that we cant be lovers any more, cause I want a relationship and she doesnt.