I admire you. You have your heart set on this guy, and you've stuck by him throughout all this mess. Most girls/guys would just say "screw it" by now and would have given up on each other, since breaking up and divorces seem to be the most popular trend nowadays...
Otherwise, just remember that communication is what makes relationships work, and champaign will only solve the problem temporarily, because once it wears off the problems are still there. Just rmember to turn the other cheek when this is over and try to get along with the aftershock. Remember, you get together with him, you get together with his past, including his daughter, and part of that also belongs to the psycho *****. Things only get to you if you let them. Best wishes!
It is impossible to love and be wise
-Francis Bacon