Is an alcoholic affecting you?

My boyfriend drinks about a six pack of budweiser a night. He goes to work sober, stops at the bar on the way home for a couple, comes home and continues drinking, passes out. Starts the next day. If he is off work, he drinks more. I have known him for four years, only been in a relationship for two, living together also. I have known from day one of knowing him that i cannot make him quit, that he has to do it himself, and i have told him that. I have a history of bi-polar, but have been quite stable for a year now. I see in my bf the anxiety and depression I have dealt with over the years. He exhibits guilt about his drinking at times and/or fibs or omits the truth (nothing horrendous, which just irritates me cuz there is no point!) Anyhow, I am trying to be understanding in that he has issues and he has been drinking for years to deal with them (apparently). The main problem that returns is that he does not admit to having a problem and rather jokes about being a "professional" and also drives after drinking (to which I am tempted to anonymously call the cops one day). It seems as if in his life he has never had consequences and thus he continues this behavior. My fear is that if I leave him, he will not see that it was his doing, but will simply slip furthter into the drinking. Sometimes he shows a glimmer of understanding that "someday" he will need to quit, but the urgency and importance is currently not there. I fear that an ultimatum would push him away. He is already an avoidant and non-confrontational person, so I am not sure how to get through to him. Whatever I say, he hears "you are bad" and walks away (even if i specifically say "you are not bad" and/or "you are good"). So, I am creating boundaries slowly between us, but I really just don't know how to get through for sure.