Friend question please help me!!!!?

Alright so i have a friend of mine..And a boyfriend of mine....lol anyways my boyfriend thinks my friend is his friend but my friend sinead says h hates her and stuff..alright so she tells me to tell him to lay off so i do..he lays off...though during recess he said something awkward and she randomly started kicking him so i tell her to quit it....then she tries to act all that and says "wtf just because your older than me doesn't mean you get to boss me around" im like "B**** please" then she thinks its all m fault and that i should apologize.....Please i tell my boyfriend to not make fun of her that much, but she has to do the same or else im not gonna even care if he makes fun of her..she has to notice that she apparently makes fun of my boyfriend to except she kicks him and much more....so should i move on and find another friend that doesn't get attitudes with me when i ask her for something...Or should i still hang around with her....ive told her this many times and she thinks its all my fault!!!!!