You can't stop him from killing himself and you can't stop him from drinking himself to death. If he's going to do either one of those things, nothing you can do will stop it.
Incidentally, AA is free. It's a buck a meeting if you put something in the basket when it's passed.
If you haven't been to Al-Anon, now might be a very good time. It's as expensive as AA.
This is no way for you to live.
Oh, and I wouldn't count on his being "inspired" by your own recovery. I eventually left my second husband, who was just as bad off as your b/f--maybe worse, since he had already almost died of liver/kidney failure. He DID continue to spiral, but fifteen years later he's still alive, and still drinking. I've never regretted leaving.