I agree with everyone else, put the brakes on moving forward into marriage until he actually can show you for a long period of time that he really wants to quit drinking and follows that through with some kind of a plan like AA.
He told me about a month ago that he is done drinking and he's ready to start his life with me.
This statement puts you in a position of you vs his drinking and can lead you down the wrong path of believing that if he loved you enough he'd stop or that he's picking drinking over you. Sadly, you have nothing at all to do with his drinking or why he drinks or him stopping drinking.
As it was suggested, al-anon is free and usually offers a variety of times, days and places. I'm sure you could fit that into your schedule and it would be very beneficial for you. I also hope you stick around here, read the stickies and keep posting.