I'm sorry for you. I know what lies ahead, having lived it for the last 20+ years.
I am a broken record with my approach.
Leave. The sooner the better. You can't fix them. They become very expensive and not very good domestic help or maintenance men. In 20 years you will have next to nothing in savings. But you will have a plenty of emotional scars to deal with.
I would not wish living with an alcoholic on anyone. Well, except that arsewhole boss I had a couple years go.
Really. Read up on here how many have had success with rehab. The numbers are terrible. It rarely works. Run, and run fast. Before you are in so deep you can't run. And before you have kids.