Hopeful4 and saveyourheart are right on. As long as your fiancé continues to drink and will not embrace full recovery, your relationship with him has disaster written all over it. And I mean life altering disaster. Please please for your sake and the sake of your future children, SLOW DOWN and think again. At the very least read thru some more of the threads on SR and keep an open mind to the warnings. Don't think "this can't happen to me" or that "he loves me so much, I just know he'll quit drinking for me". It doesn't work that way when a person is an alcoholic. There won't be anything you can do to make him stop drinking. Period.
As another poster said, I don't mean to sound harsh or pessimistic, but there is too much at stake for anything but total honesty.