My friends keep fighting.?

My 2 friend started fighting And they started cussing each other out. My friend was being a total prep. SHe said "my hair is pretty isnt it?" and this other stuff. Then my other friend said she was b word. And then she got mad. then the next day. Which was today was talking to another group of people which i was in. She heard her talking about her and then she starts yelling so every1 starts to back off then my friend starts laughing. Then couple of my guy friends start craking up and laughing. Then this happened at recess. And my friend starts cussing out my other friend and my friend starts crying after. so my other friend and i get worried so we go towards her. Then my other friends ask y she is crying. So i said beacuse of this. and then this kid comes up getting so hyper about what happened so he starts yelling and laughing saying how awesome it was. and then i sit by my friend who cused out my other friend. And she keeps talking about my other friend and same with my other friend. She keeps talking about my other friend. What should i do? We were all best friends because all the girls in my cl arent really our friends and 5 of my friends hate it how they keep fighting and talking about each other..... wat ahould i do????