Broke up with my bf upset need serious advice.

This is a very sensitive subject for me so please no judging or mean comments. Only comment if you have something positive or helpful to say. My bf or ex bf i should say cheated on me several times. I was depressed and very lonely and took him back last summer i think. (Ik its not a good reason but i was in bad shape) Then I found out he cheated again with his ex after he found out I was pregnant? So I put the nail in the coffin do to speaking regarding us ever getting back to together. We argue constantly even though we're not together. He keeps saying that he thinks we argue because of misunderstandings. I always say our relationship is at the breaking point because he lied and cheated. I feel like he doesn't view cheating as bad as it really is. I'm an emotional person so when someone hurts me i take it pretty hard because I'd never do what he did to me. Am i wrong for saying that our problems stem from him cheating??? He makes it like i should basically just get over it but it still hurts. I never bring it up for spite I'm just trying to get him to understand why we're not getting along because it still hurts. What's hurts even more is that these twins were not an accident. He wanted a family with me. I told him how can you try to have a family with me while still giving attention to your ex?? I was so angry with him i told him i wish i could forget i loved him and that i wish i could never see him again. I've also said I deserve better. Am I wrong for that? He says even tho he cheated. I still shouldn't say things like that but I feel like he's being a sensitive ass mf. Who wants to treat me like shit but can't take some truthful words. Thoughts? Should i be nicer? Am i being to mean?