Hi! Sorry you are having some confusing thoughts in your head about this. Know you are not alone!
Rationalizing doesn't change who he is, or who he is going to be. I have done the dance myself - he's so nice, we communicate well, we have a lot in common. And, I too, have gone down the thinking that if all these other parts are good, I can deal with this small issue of him being an alcoholic, because it's too scary to go out into the world and find a guy who doesn't have these issues. And, chances are because I've got these co-dependent tendencies, I'm not going to find a healthy guy, but another user of some kind or another. And, maybe, just maybe, this is the best guy I'm going to get and I should stick it out and figure out how to help him so we can be this wonderful, uber couple that I know we can be...if he just stopped drinking and I fixed all his problems.
Sounds like a plan to me!
I'm amazed you've never seen him drunk in 10 months! Are there other red flags going off besides him always having a drink in his hand? Obviously, there must be something else, or you wouldn't be here