I would say since he is making strides on the depression end keep giving him time. REmember he is making steps, and to get to the drinking, relationship, and all the other problems; he first needs to get over the depression part. I would say keep things as they are, but make sure you aren't getting too attached (my mistake). Maybe it is time for a R talk when he brings up marriage, that you want to "date" him again. See him take you out on romantic dates and get to know each other again. Also you may want to set a boundary of no talking while drunk. That may help him to realize that now and later you won't tolerate the drinking.
As things progress and he pushes getting back together, let him know that one condition you have BEFORE you decide to leave your parents is marriage counseling. Bring it up that it is for both of you to be sure neither falls back into the same patterns. This will help you and him to learn to communicate better and he can learn to not always put himself first.
Just some thoughts. Believe me I have no idea what to do, and I just now found some much needed clarity (not the answer I wanted, but God knows what is best ) in my life. So some things to ponder.
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89