What should I do about this girl?

I’ve been fighting on and off with this girl in my school for 3 years. In the 5th grade I asked out her best friend, so she decided to start calling me a sl-ut. I was in the middle school without her for a year, but when she got into the middle school, she started her crap again. So I decided to start mine. She went to the principal on me and it ended for a year. In 7th grade, she started it again, but it was worse. The whole school was like after me. I was getting pis-sed off, so I pushed her and 3 of her friends onto the ground, and I pushed her boyfriend into a locker and called him a fa-ggot. I got written up for it and got a hall restriction, so I decided to stop. It started again in the beginning of the year this year, and it stopped. It’s starting again. Today in the snobbiest voice, she said “hi” with a big smile on her face. I looked at her all pis-sed off and turned around to go into the classroom. She screamed “What?!” I turned around and said “You’re a sl-ut.” And walked into the classroom. I like beat up my teacher cause she was in my way and I was crying. I started flipping out. I was like, “If that bit-ch wants to start her fuc-king shi-t, I’m pushing her down the fuc-king stairs, and hoping I get expelled because I’m having a really bad fuc-king week and I’m sick and tired of this retarded as-s school and the people in it. :/ I don’t know what to do. I don’t really wanna get expelled cause my mom’s already pis-sed off at me.. Helpp?