I have a friend....?

I have a friend and she goes on and off with me. One month we are friends the next month we are not! This haves been happening since 4th grade and I'n tired of it. They claim her as HARD but oh well if ah gotta fight then ah gotta fight im tired of her and if ah wanna talk bout sumtin wit her she will say " why are you talking to me I dont like you"! So what should I do...???