Some day you are going to have to leave this guy. It can either be now when you have very little invested and still have the emotional strength of a healthy person. Or, it can be in the future after you've thrown away years of your precious life, are totally bled dry, and very sick yourself.
If you get really lucky (and I'm NOT being sarcastic), he will blame you for his drinking and then heartlessly abandon you. That's what we call on SR him "doing you a favor".
We will be here for you no matter what happens.