You say that your boyfriend is a wonderful boyfriend when he is not drinking. You then go on to say he is drunk 3-5 times a week and blind drunk 1-2 times a week. So when is he wonderful and not drunk?
Do you know what enabling is? It's where we do things for the alcoholic that makes it easier for them to drink. Like looking after them when they're drunk, drinking with them, making sure they get to bed, making sure they don't bleed to death, making them agree to promises they can't keep...
YOU are exhibiting CLASSIC codependent traits and unless YOU get some help YOU will get sicker and sicker until you think you're losing your mind.
You can't make him stop. He has to want to stop for himself and he doesn't. This behaviour will continue for YEARS and YEARS until YOU do something to make it stop.
Alcoholics don't have relationships, they have enablers.