I have a friend who is really mean and I have a guy problem they r connected help?

[hollister cutie]

So we got moved in a class(i got put next to the guy)and my friend I cant stand told me he was an ahold and started a huge fight. So He was tryied to eat my earser I called him an ahole. He was like who told you I was an asshole.I say say wat how do you know tht.He said cause most people think he is an ahol someone had to tell me.He wouldnt shutup so I told him my friends name. All week he was saying things like I havent even talked to her before.I said well I wish I didnt talk to her too it slipped he didnt say any thing about it.fast foward to friday and I was talking to my bff and my friend thts mean came behind me unnoticed. I told her it was a secret cause I didnt want her to hear she cried.she thought it was about him.So she went to him at lunch and asked him and he told her all of it. So wat do I do! I have to sit by this guy. I am tired of my friend how do I tell her I think we should stop being friends??
thanks if you answers this.