Hi, welcome to SR
Please don't beat yourself up, you had enough of that coming from your ex. Your story sounds a lot like mine and I've struggled a lot with the pain trying to make sense of it all. I decided the other day to turn my pain over to God and I instantly felt a sense of relief. I'm not even that religious but it seemed to help for some reason.
He will most likely not quit drinking so don't entertain that fantasy anymore. The BS words and the verbal abuse are incredibly painful. The broken promises really suck so you're not alone.
Things get better!
-z