Hopey.....he is in denial about his drinking and the effects on himself and others. Denial is a thick--thick--brick wall. You can turn yourself into a pretzel with talking, arguing, crying, ranting and raving---and it won't make a dent in the brick wall of denial. It is much stronger than you are.
Alcoholism is progressive---it always gets worse over time, unless it is interrupted by permanent and complete abstinence. It doesn't sound like he rolls with the concept of complete abstinence..
Think of what your life and mental health will look like, this time, next year--after another year of living like this. Think about 2 or 3 or 5 years from now. Alcoholism, left unchecked, will destroy the alcoholic, of course---AND, it also damages all of those who are close to them.
We all do understand that it is painful to end a relationship...it can hurt lilke h**l. But, you will grieve and get past the pain. If you stay involved---the pain never ends, as it just gets worse and worse over time.
I call this the "Short-term pain for the Long-term Gain". Sadly, some people stay in the painful situation forever, because they are too afraid of the short-term pain.