My Fiance is an Alcoholic

I'm posting this Anon because I really don't need any judgement, just advice. Long post warning..

We've been living together almost 2 years and have a wedding planned in April. In the beginning I never questioned his drinking because both of us were social drinkers, and we never drank anything hard, just beer. After we moved in I noticed that he liked drinking a little more than me. I brought it up gently now & then but he assured me there was nothing to worry about.

He would go days or weeks without drinking then hammer down an 18 rack. Still, I didn't question it too much because he never actually got drunk drinking that much beer (that should've been my first sign). We moved into a nicer place & changed jobs so we'd have more money and I made a deal with him that we'd never drink during the work week. Soon he was drinking every night though. Sure, only one or two beers a night, but I got worried. I tried convincing him we needed to stick to weekends. I'd say no to a drink hoping he would too.

I had convinced myself that he was an adult responsible for himself (he never drank & drove, he never got "drunk", never got mean, etc). I had convinced myself that if he wasn't causing problems when he drank, his drinking wasn't a problem. He never got angry or anything. Just liked to drink...until a few months ago. There was one night when he had a 40 and two 20 oz beers on top of that. Apparently that was the magic combo to trigger him. Now look, he never put this hands on me, never threatened me, never even called me names, so know that before you try to lecture me. He just got loud and aggressive- he'd pick arguments about things we weren't even talking about, he liked to slam doors over nothing, and the night always ended with him wanting to leave. There have been a few of these nights in the last few months. After the second time I told him I didn't want alcohol in the house anymore. Of course, that lasted a month and he convinced me he was fine.

Well, he's not fine. This morning he told me he's an alcoholic and he knows it. He told me he doesn't want to end up like his father, that he's sorry for all the problems he's caused while drinking, and that he's getting a therapist today. I'm so proud of him for this! I love him with all my heart. He's adopted my son as his own and he's an amazing father! Now I need to know how to help him. I don't want to be an enabler. I'm not going to leave him because it's not his fault he has this disease (or whatever you want to call it). For those of you who have survived a marriage to someone with an addiction, please give me all your advice! This step is going to be the hardest, but the best.