Many red flags going up here.......even though we were not married, I was in a three year relationship with an binge drinking A and as as others have said, listen to your instincts, your little voice.
It took me a long time, lots of heartache, lots of denial, going to Al-Anon, coming to SR to finally realize that as Laurie 6781 so aptly pointed out - alcoholics don't have relationships, they take hostages. I did not cause my EXA to drink, nor can I control it, nor can I cure it.
Keep posting and reading here (especially the stickies at the top of the page), find an Al-Anon meeting, educate yourself on alcoholism and think seriously about postponing the wedding.