Can’t handle a break up

So I wasn’t happy in my relationship anymore and I tried breaking up with my boyfriend and he freaked out and has a nervous break down so out of guilt I stayed. Im just not happy anymore but I stay out of fear he’s going to hurt himself. I don’t know what to do...

We live together and I don’t have a car so it’s not super easy to just walk away from him considering he’d have to drive me and my stuff a hour after I break up with him which has made everything so much harder.