Schizophrenic boyfriend, broken heart, need to vent and advice :(

He is 22 and I am 21. We were each others first love, started "going out" when we were 13. He has always had mood problems but when I was 16 his manic depression was too much for both of us to handle and I ended it. Fast forward 4 years and we're both in a seemingly better place with our lives, he is stable and long story short we fall madly in love again, everything just clicks, he's my best friend in the whole world.

A few months ago weird things started happening with him, he had a few episodes and was diagnosed with schizophrenia and put on anti psychotics (that don't seem to help besides turning him into a zombie). I don't want to drone on about it but if anyone needs more details feel free to ask. Of course I stood by him told him we would get through anything and I really meant it, I mean this guy means the world to me. But lately things have gotten so bad that he's started lashing out at me, saying very mean things and actually being very cruel, having paranoid thoughts about me and I know he can't help that but it has just turned our whole relationship into a fucked up vicious cycle. It's literally a living night mare, the things that go on in his head & what he acts out.

I broke up with him earlier after a fight and I feel so terrible. Where is the line between supporting him with his mental health issues and taking a stand for myself? I feel like everything in my life has started to revolve around his mental illness, but after being together for so many years, shouldn't it? Wouldn't I want him to stand by me? I'm so confused. I don't even know if this is making any sense at all. I don't even know what specific advice I'm asking for, I just need some :(

If anyone even read this far I really thank you for that. Blessings PS please excuse any errors I'm typing this on my phone & I hope I spaced it correctly