prettyfractals,
Sorry you're dealing with this. We can't tell you what you should do here, but be advised he won’t change unless he decides he wants to change. You have no control over his drinking at all. You only have control over how you respond to it. I strongly recommend getting out. Sorry, I hate to seem so blunt. I had a similar situation with my ex fiancé. I left. After several stints in rehab, he coudn't shake his habits. His actions were making me ill. I had to think about me, just like you have to think about you.
You need to decide what you can tolerate, and that will decide what you should do. Do you want to spend the rest of your life dealing with this? In the event he's unable go sober (and chances are, he won't), ask yourself if it's something you (and possibly future children) can live with for the rest of your life. Good choices are rarely easy. I wish you the best in whatever you decide. This community has your back - stay active in it!