What should I do?

This guy has hurt me so bad, and he know he has and he feels bad for it. But we still talk and we still act like if we was together (it's annoying really) and he told me that if I slept with somebody else he's gonna be jealous and pissed off mean while he sleeps with his "girlfriend" And I told him that and he changed the topic because he knows I'm right. I been talking to this guy and I'm starting to like him a lot and we slept together and I enjoyed it and it wasn't with the guy that hurt me bad anymore. I was glad it was somebody new and this guy is really sweet and when we're together we're always laughing and playing around. I really like it. Should I tell the guy that been hurting me that I met somebody new and I'm enjoying him and I already slept with him? I don't wanna make him jealous, I just want him to know I can do things as well and you can't not hurt me no more??? What should I do?