My boyfriend get's aggressive when drunk, how do I break up with him while avoiding unnecessary drama and violence?

Im having bf-trouble.. I’ve been with Paul for three years now, and I’ve never shed so maby tears for a single person. Our relationship is on the rocks, and everytime I try to save it I get hurt. I went to my parents for a while, meantime he realized what he did wrong so when I came to visit he apoligized and said that he wanted me back and that he doens’t want to live without me. And that he’ll treat me better. So I went back. Now I’m back @ my parents again, bc last night, he said he’s gonna go with some friends, and that he won’t home later as 1AM. He called when he was out, and asked if I would join him. I couldn’t my eyes were half open and I had a bit of a headache. He wanted to stay, so I said fine but I’ll be sleeping are you gonna come alone? Yes definetly, of course I’ll come alone. What does he do, he comes home at 4AM with friend of his. I was like whatever as long as he’s quiet he can sleep on the couch. I asked what time it was he said 4AM. I said ok great but you just wait and see next time I go out I’m gonna do what I want to and come back when I want. He got angy bc he was drunk I guess went the bathroom and started chatting with his friend. I was like could you keep quiet I want to sleep but he wouldn’t! He kept on talking as if he has no respect whatsoever. 4AM blablabla not even wispering, normal loud voice. So I started yelling, after asking normaly three times, he became more angry, he started insulting me, I asked his friend to leave he wouldn’t. My bf threatened to pull my hair out, kill me, beat up my parents, blabla etc, if I don’t come and pick up my stuff sunday he’ll destroy them first and then throw them on the streets etc etc. My mother had to pick me up at 5.30AM.
I just want to live a simple, quiet life, with a sweet guy, is this too much to ask? I’m not used to being alone anymore, and I’m scared what the future has to hold. Im scared so many guys are worse and nobody can make me happy. I just want someone to trust lean and rely on, someone to love. I never asked for this bullshit, and still, I wish he’d call me and apologize for being a drunk idiot. But I know he won’t. Why do I still have hope? I just want to let go of all this, somehow I can’t. He’s 27 and wants kids in the near future, but I wouldn’t trust a baby of mine with him. He has no patience. And I’m 20 and I don’t want to waiste my life..