Welcome,
All I can say is, if you do go forward with the wedding, I would not have any children with him unless he was not drinking and working a strong recovery program for at least a year, not white knuckling it.
Read around this forum, lots of great informaton. To me, children do not deserve to be raised in an alcoholic family, it will damage the child, and I am sure that you do not want that to happen.
How about waiting a year or so before considering marrying him? Sit back and watch his actions, ignore his words, they mean nothing.
Keep posting it will help.