I need advice...

How does one deal with an alcoholic SO? I don't wanna make excuses for him but when he's not drunk he's actually really great, even when he's drunk he's okay but the thing is he drinks all of the time, I've had soooo many talks with him about it & he never stops. It makes me sick to my stomach to see him drink all of the time, it actually disgusts me. I'm done repeating myself & I'm tired of him not changing... 30 weeks pregnant & he doesn't seem to want to change either. Is this when I call it a quits? 😔 am I overreacting?