IMO... he is playing you.
He will continue with this game as long as you allow it. I don't blame you for feeling angry, I would be livid. He wants to keep you and he wants to keep drinking. Don't be surprised if he starts hiding it.
I had promises made to me and I kept going back like a fool. As soon as my back was turned he would do whatever he wanted to anyway. I felt very much the same way as you do, I was playing second fiddle to vodka. The alcohol always came first and it was fine (in his opinion) to be too drunk to do things with me, or to have hangovers, or to be at the bar after work every day instead of spending time with his girlfriend.
I played this game with him for 3 years. You do get sick of it. You feel betrayed, worried, disgusted, angry and miserable. I think this is a good boundary for you to be sticking to. I am proud of you! Don't do what so many of us have done and give him way too many chances, it's a waste of brain cells and a pointless way to spend your life.