Everyone here has given excellent advice and feedback.
Alcoholics quit drinking when they are good and ready, and not a minute sooner. He may go on this way (progressively worse) for years and years and years before he is ready. He may NEVER be ready.
Remaining involved with this guy is only going to lead to more heartbreak. I know, I've been married to two alcoholics. One got well, one didn't. I didn't have control over either one. The one who got well did so when I stepped away from the relationship because I couldn't deal with the insanity anymore. The other one is, so far as I know, still drinking himself to death. Their choices, not mine.