There are some good stickies about boundaries.
I know you think this is complicated, but it's really quite simple. "but I got back together with him with the deal being that he had given up the booze. "
You made a deal, right? That is not unlike setting a boundary. The deal is=I stay with you, and you give up the booze. He hasn't obviously given it up. So...you need to decide, are you gonna let your boundaries be trampled and disrespected? Or are you going to stick to what you said you would do?
Believe me, I have sympathy for you. I've more than once bent on a boundary, but let me tell you-once someone sees they can push your boundaries and get away with it, your rules and wants and needs will NEVER be respected by that person.