Break up rant

Azalea • ✊🏾
My ex broke up with me after a year and a half of dating and he said he couldn't handle stuff anymore. I fought to keep him but he just wasn't hearing it. A few days later I got drunk and had sex with a guy I knew. And then a few days after that my ex tells me he wants to get back together with me after he already broke my heart and told me there was NO hope of us getting back together. I told him I had sex with someone else ahe said we would work through it, but overnight he changed his mind. Now he says I cheated on him and he hates me and that he did everything in our relationship. I already knew I was in the wrong but later on he tells me that he had sex with some other girl when he and I were talking. So basically I'm trying to figure out if I'm in the wrong for this because he is really treating me like shit and I don't think I deserve that after all the stuff I had to go through with him.