If you want to stay, then stay, but I would strongly urge you to put any wedding plans on the back burner. If you have been reading here, as you say, then you can see what the future holds for you if you marry an alcoholic. Why would you tie yourself legally to someone who honestly has no desire to stop drinking? It's your life, but I don't think anyone here is going to advise you to marry someone you already appear to be so miserable with.