I just don’t know

So last summer my best friend and me “broke up” and I’ve been trying to get over it but it’s been so hard because we were like sisters and I just say she’s a bitch and stuff to keep myself from breaking down but it’s getting hard especially since she just followed me again to start issues. I have been depressed but thinking about her just makes it worse. Is it stupid to still care this much? Like I have tried on multiple occasions to mend our friendship because I miss her but I just don’t know if I should keep trying. What should I do? Because it’s really effecting me and I don’t like how it is.