What would you do?

So it’s happened several times, where my son’s father has melt downs and keeps us up into the late hours of the night. He always says it’s not going to happen again and he’s sorry. But of course it always does. I’ll be holding my son and he gets into my face yelling. I of course ignore it because I don’t want my son to freak out . But it just makes him more mad. I thought it would start de escalating. But last night I had my son on the counter giving him snack since he was keeping us up again. He got into my face and this time I got upset, I always tell him to think of him first. So I pushed him away and said don’t do that. Then he grabbed me and pulled me away from the counter and of course my son are reaching out to each other. I got nervous he would jump off. And my son clearly looked nervous. I had to pry free of him and went to console my child. He starts again I’m sorry I’m sorry and now my son is saying “dada pushed mama”. He said no that’s not true. I said you’ll teach him to doubt himself when you say that. Anyways. It wasn’t until 3:30 my son fell asleep. I’m getting a camera. Nobody believes me when I tell them the stories. I don’t know how bad this is. I never thought I would live through this with him. It’ll be good some time and then he does things like this again. What am I doing wrong? Am I not handling this correctly? I don’t know what to make of all this. I feel like I’m going crazy. Thanks for hearing me out.