I had alot of bottoms along the way and none of them were ever deep enough until it started to directly affect how I function physically. Just getting hammered, being belligerent or other asinine abusive behaviour is not going to stop it most of the time.
It should be noted though that there are people here on this website that are in failing health and still imbibe. Your Fiance will likely need to make the decision themselves before they can stop for good. It is not likely that any amount of goading from you will stop the behavior. Sorry to have to put it so bluntly but your Fiance has to want it for themselves and no one else before recovery can begin.