I want to break up with my boyfriend but im too scared

Ive been with him almost three months.

It started off like a fairy tale, honestly. He was loving and kind and all the things i never had coming from an abusive relationship. Then, it turned. He told me he previously had a drinking issue that he fixed, but he drinks from the moment he gets off work sometimes. One time, when i stayed at his, he took a bottle of vodka into bed with him which i took from his arms.

He already has tried to propose, which i said I wasn’t ready for. He’s jealous and constantly suspects me for doing things like posting funny pictures of myself on my spam with the caption “for all of your viewing pleasure enjoy my middle school phase” to which he commented “uh shouldnt that be mine” he’s admitted he does get very jealous but won’t work on it.

I’m just tired. I don’t want this anymore. But he tells me he only goes to work and lives for me, that without me he’d be better off dead. I don’t want to be the reason he hurts himself or gets alcohol poisoning, but i am not happy at all.