Hi NoWordsGF. It's really good that you have joined here and have realized that your boyfriend and you need help. There are several things i've taken from your narrative and, although i'm not a professional (therapist, etc) nor even very experienced in life issues (i'm 32) nor even very stable (alcoholic myself), I think I can contribute a little.
1. Your boyfriend definitely needs to start seeing a therapist. It's not easy for most people to open up about their innermost feelings and, from the way you've described him, it's likely to be much harder for him. I can relate because i'm more or less the same. There could be some cheaper options for therapy available... You need to do the homework on that. He had a very traumatic childhood and his drinking is just going to make it worse. He deserves a chance at a good, normal, life.
2. As passionate as you are about helping him, I strongly think and advise that you start thinking about your own health and put yourself first. If that means you breaking up with him if he's not responsive to your efforts to get help, then so be it. You've already started drinking daily with him. It can only get worse because, tbh, most people, when they start to drink, don't even like the taste much... until they do. And by that point, they're hooked. Of course, not all evolve into alcoholics but why risk it? Stop drinking with him altogether. And two card him about the therapy - so it's either he gets help or you're out. That will show you how much he loves YOU (after all, YOU love HIM 'to death').
3. To reinforce point 2, you cannot help an active alcoholic. You cannot be in a healthy relationship with an active alcoholic (who is not even willing to get help). They will only pull you down into the dark abyss with them. Do not even consider a long term serious relationship (marriage, kids) with an active alcoholic. Again, focus on yourself. You are very young and have a lot of life ahead of you. Don't waste it.
You've taken the first positive step coming here. Keep reading. There's lots of resources here. Both you and your boyfriend can pull through this (either together or separated) but it's going to take work. A lot of work and, perhaps, some difficult choices will have to be made. Don't make the wrong decision. You come off as very intelligent.
Best of luck.