bf chose alcohol over me

Yesterday it was my best friend's birthday. She is also pregnant but her husband wanted to go out to a bar. Even though I did not want to, I agreed to go for one hour. After an hour i asked to leave. My bf was so drunk at this point he blew me off. 20 mins later asked again. Then again. Then again. I went into my car and waited for him. 20 minutes later he comes out, yells at me for making a scene and leaving. I tell him I don't want to talk on the way home so he opens the door and jumps out of the car while I'm driving. 🙄 like seriously??  I am tired and annoyed and want to go home. Finally get him into the car, drive home. I asked him if he would stop drinking because he asks so immature and treats me like crap when he does. His response? I shouldn't have to and we need to break up.  Mind you, this was while he was still drunk.