Welcome, JDR. What a tough situation. I would suggest doing some reading about codependency, as this situation sounds like it falls into that trap more often than not. Most addicts, alcoholic or otherwise, fall into this destructive habit.
Since he has said he doesn't want to get sober and sounds like a dangerous drunk, this is not someone who should be in your life right now. It's hard enough to stay sober being around sober people; being around an active alcoholic is a sure road to ruin. And I've said this many times - alcoholism is progressive, and it can always get worse. He could have killed himself or someone else in that car crash. If he doesn't realize how serious that is... Well let his mom deal with him then. Last thing you need is an unsupportive boyfriend! Go for total sobriety :-) you can do it