Can My Boyfriend Die If I Leave Him?

I've been with my boyfriend 2 years and some.
I knew he had a drinking problem around the 5th month when he had to run to the doctor and they told him he had HepC.
I thought to myself it was bc of his recent divorce, and it would pass... But it didnt. He stopped for about 3 months tops. After that it has gotten progressively worse. He has many childhood traumas that are horrible, that I had never met anyone that had gone through one of his issues at all, and he has gone through like four. So since I love him and I really care for him Ive always tried to help him.
We have had great times together and also nightmares.
Point is, after all this time nothing has improved. He went to an online therapist for 3 weeks and then stopped going. Later he stopped drinking for a month and started again.
Recently he moved to a new place on his own on a Monday.
On that wednesday he was drinking again and he did some terrible things to our relationship...
I tried breaking up with him thay wednesday (which I have thought of doing for a while, though I love him).. throughout thursday friday and saturday he went on a binge drinking, he did not go to work, he drank about 4 bottles of vodka and some beers... I was at my own place during this but I was just terrified thinking about him bc he hadn't talked to me for 2 days. Then he calls me and asks me to go help him. And of course I went. I had the worstttt time of my life. I brought him to my place to sober him up and make sure he went to work. He told me I saved his life bc he would have kept drinking and killed himself from the drinking.
I got back with him and told him I love him and Im not going to leave him alone. Now two weeks later Im at my house and his phone is off and Im dead worried about him bc we had an argument earlier today.

I want to break up because Im always nervous about him and Im not happy since is not doing any program to get better, he is trying to do it on his own and he fails a lot at that.

The problem is, I am dead worried for his life. He has told me before when drunk that he is going to kill himself and that his life is purposeless. He had a really troubled childhood with basically no parents. He does not have many friends. I would say his sister and two friends but they are not constantly there for him. He has almost no family. He relys on me emotionally. Im afraid he is drinking today.Im afraid if I break up with him he will go on another binge drinking like two weeks ago. Im afraid he will drive and get into a car accident (hes driven drunk before and broke him rim with the sidewalk) ... Im afraid he can lose his job and his apartment for not paying the rent if he has no job. He has no savings at all. He is addicted to weed but he doesnt recognize it. Also, he lives in an apartment now on the 7th floor and Im afraid he can commit suicide too if he finds himself drunk and lonely.

I really love him and care about him and Im scared for his life. Please advice.
Bf is an alcoholic. .he will drink with or without you. ..any excuse will do...his past....you leaving...work...the red light on the corner or he stubbed his toe...it doesn't matter...it's got nothing to do with you...your just making it easy for him to have something else to drink about...detach...disconnect. ..you cant fix this. ..an alcoholic is an addict..
You should go to the doctor and get checked for hep C yourself. Meantime do not use any of his razors where you are in contact with his blood. Toothbrushes, nail clippers etc. Good news is hep C is curable nowadays. Read up on it and get tested!. Your boyfriend is doing weed too? Are you sure he isn't doing intravenous drugs? Usually you get hep C from dirty needles. You need to make yourself your number one concern, not him.