Am I being irrational?!

So my bf/fiancé (whatever you wanna call him right now) is being an immature asshole. I just found I'm pregnant with his baby and he told me he would quit smoking cigs and quit drinking. Well he hasn't quit smoking and that's all fine and dandy but his drinking needs to stop! I will leave his ass and go back to Michigan if he doesn't stick to his word on that. I live in Florida currently with him and have no family here. All his family lives here in Florida so lucky him. Anyways the other night because he was drunk he decided it was ok to put his hands around my throat and shove me in the chest and jaw (still a rash mark on my jaw) all over a phone he misplaced and I told him I saw where it was and wanted to show him but he was so delusional that he didn't listen to me and did what he did. I didn't sleep next to him that night (I slept on the floor in a different room since we don't have a couch and we are renting). Tonight I come home after working and he is home drunk in bed after saying the night before how sorry he was and wasn't going to drink anymore and didn't remember blah blah blah. I'm so fed up. I don't want to share this baby with him and I want nothing to do with him if he continues this road. I'm feeling lost on what to do. Yes I love him and he's the sweetest man I have ever met but when he drinks he's different. Maybe he needs AA and then we can go from there. But should I give him that chance to redeem himself?.. I don't know if he deserves that. I will not give my unborn up for adoption. If I ever did that I'd feel Iike a POS!!!! I want to be in my child's life everyday because that's what a great mom wants! I don't believe in abortion but if it means not having to deal with his ass then so be it. I don't want to split custody. Not an option. I have no relatives to even help me watch a baby if I have to work. ZERO!!! Everyone works all the time in my family. This man was suppose to be my rock and he changed on me just recently with becoming physical and some mental. But he still was sweet to me today while at work and texting. I need advice and please be kind because I don't want to get all worked up more than I am already 😞