Hi sketscher,
One word, honey......Al-anon. Sounds like a no win situation. I can tell you from past experience, get out before it tears you completely down. Easier said then done, but the alcoholic's lives are so filled with drama and ups and downs and more drama and heartache that it just wipes ya out.
You gotta take care of you. I'm a RA of 11 years and ended a relationship with my xabf about two months ago. So, i've been on both sides and neither one is pretty. Don't let this drag you under. I know that you care for him, but there are SO many better things for you out there in this world. Only sad and lonely times will come with an A and one that is dealing with divorce and a brand new baby.
Do for you with the faith that there is a much better life out there for you than what you're in now. You may not see it or even imagine it at this time, but once you take care of yourself and your needs, everything else will fall into place.
Keep posting and hang in there!
((hugs))