Toxic best friend

My best friend is so toxic to me. She tries to copy ech and everything I do I am just fed up of this. She literally checks comments on my insta post and sees who has commented what and also sees what I have replied to everyone likr wtf?? Tties to control me and says She owns me like wtf no. Sometimes I just want to block her. She thinks so high of herself and idk for what. I have cried so many times