I need help gng

me (m 18) have a crush on my classmate (f 17) and she is a extreme baddie I must say. I told her before that I liked her and we also tried to go out but I had to cancel it. She gave mixed feelings sometimes flirting with me sometimes being cold and it went onto my nerves. Therefore I left her on opened and didn't contact her and ignored her for several weeks. Now she teases me in online classes. After some weeks I kinda teased her back on social media on a post of a friend trying to start an argument (which I won). In that argument I did call her a fangirl and to leave me alone because she was obviously mad at me stopping our contact. It has been several weeks again but I see her everyday and I also have to think about her almost everyday. I want to open up the contact again but idk how guys please help me chat