Scared of breaking up

I know that I need to leave my bf. I’m not happy and haven’t been happy for a long time. He doesn’t treat me good and I’m not sexually attracted to him anymore and everything has gone to shit. And we’ve had talks after talks after talks and he’s not changing. I can’t stand to be in the same room as him. I’m just scared of being alone. Even though I can’t stand being in the same room as him, thinking about being alone scares me. Thinking about starting a relationship with someone else or just dating around scares me. I’m scared when I think “what if he does change” but I know in my gut he won’t. I’m scared when I think “well at least he’s been loyal to me, will I find that ever again?” Or when I think about how good we look together I know that sounds so fucking stupid.

I feel so weak I know I am. I’m upset of having to move back to my parents house as of not being able to afford a place by myself, when I really like having my own place. I will miss this town so much. I will probably have to switch jobs when I really like my job right now. It’s a huge life change and I’m scared. I need some advice or encouragement because I feel like I can’t do this.