How do you guys deal with a breakup?

I’m going through the works right now from a year and a half relationship. I was with a guy I fell in love with, communication was really bad he would ignore messages calls, we lived in the same town and only asked to see him once a week and he always gave the run around, blocked me for a month then came back mad that I was out dating by the third week assuming it was over. He snatched my phone and went through it before we even got back together after that situation and accused me of lying when he was nowhere to be found. Anywho, we got into it over Thanksgiving about him coming to meet my family for the holiday and he refused to come. I lashed out, he blocked me and then came back and broke up with me. We still stayed in contact daily and I tried to convince him to work out our issues. He was wishy washy about it and after 2 weeks, I lashed out on him again. He blocked and then unblocked, but he will not speak to me. I’m upset about it all, because why did he come back only to not make things better and turning it toxic by grabbing my phone and all of the blocking. I am not innocent because when he does this. When he does this, I contact him from other numbers apologizing knowing I am not wrong for what i’ve said. It triggers old memories from a 5 year relationship I was in where the guy disappeared for 3 months popped back up like nothing happened and would block when he got mad. I always took the blame to make it right. He eventually left me for a girl in the same sorority I was getting ready to pledge. I’m finding myself crying to the tears sting my face and thinking about him constantly. What do you guys do to get over a difficult separation?