Hi SofiXXX,
Welcome to the family!
Sorry you are having such struggles!
Reading your post I have some concerns. Why did you feel the need to change your belief system for your partner? Did he ask for this or did you feel that you could not be Muslim while being with a non-Muslim? Is it possible to just be yourself and yet still be with him?
Does he only act this way while drinking or does he also speak of himself in the third person when not drinking?
We all have different beliefs about love, but I would recommend you be a bit wary with thinking you can be another person's happiness.
I think another goal might be to work on your communication skills with him and see where that goes. Getting along is a big enough goal!
Take care!