I'm so scared when will it be okay?

i don't know if my other post posted already or if this one would post but my own bf has been harming me. I don't know how to leave this relationship. It's been 3 years since we've been together but everytime i try to leave i feel like he would harm the people around me. The police still won't listen to me and i am at my breaking point. I cannot continue anymore. I don't want this relationship. i don't want to be stuck like this forever.