ya said a lot and theres a lot of different suggestions. 1st off, you and your fiance are allowing it to happen around you. why should he do anything about it when you are helping him continue living in an insane state? rather insane for you to be alowing it,too.
you can keep him around you and keep it up and love him to death or you can stop enabling him, let him hit bottom, then decide he wants help, then love him to life.
its your choice and i hope for your own sake you stop living in the insanity.
the best move anyone around me did when i was a practicing alcoholic was to throw me out of their lives.