Welcome to SR BF.
This is the only place that I found like minded people to support me quitting alcohol.
I had felt before, and once decided to quit. But each time I didn't want to quit. I wanted to still drink moderately at social events, etc. I always slipped and fell and did something I would regret. This time I want to quit.
The choice to quit is something that will have to come from your fiancee. When I first joined here I still was unsure if I could moderate my drinking. After reading everyone's stories, I realized that I couldn't. If he is open to it, reading some of our posts may help.
Good luck to you both.