Dealing with an alcoholic

Al

Ladies, what do I do? I’m almost 8 months pregnant with my first baby and my fiancé that I love so much has a drinking problem. When we first met 2 years ago he told me he has had struggles with drinking, but he’s gone to AA before, and he did quit for awhile, but now it seems to be creeping back in. He doesn’t drink everyday, but when he does he becomes verbally abusive and violent. He’s never hit me or anything, he gets violent by throwing things and slamming doors etc. it’s so hard and I don’t know what to do because when he is sober, I swear he is Prince Charming, the man of my dreams. Do I leave?? I’m so confused.