My sister made me realize I am, unfortunately once again, in a toxic relationship, and has brought me to break up with my girlfriend

I didn't want to but I don't think the relationship was healthy for me. I feel really bad for leaving her like that, but I believe I had no choice. I am hoping this will not cause issues at school for myself. I am not in a great place right now emotionally. I may seem not like myself for a while. I will be okay, but I will take some time to get over my 4th ever break up.