Should i feel guilty?

Hey guys this my 1st time posting.So to just get u up the speed i had a bf that i was with for almost 2 years n we broke up because i found out he cheated on me n got his bm pregnant.i found out he didnt tell me..fast forward so i have been single n talking to other guys.i even slept with someone just to try to move on but it hasnt help. The last time i talked to my x he was angry bc i fucked some1 else.But i told him we not together so why u trippen.Now he's like so if i fuck other ppl would you still want me,& you never love me for u to do it.i just feel like he's trying to turn it on me.Question is should i feel guilty for being with someone else n Should ii just move on? Let me know if in wrong..