Im scared of loosing my best friend please help me!?

I dont know what to do pleas help me ! I have two best friends named Andrea & Veronica. Andrea has a bf & Veronica always flirts with him & i kept telling her dont flirt with him because Adreas gonna get mad. She denies flirting with him but even she knows she is. Andrea found out & comfronted her saying bit*h stop being all over my man & what not so now Veronica & Andrea are not speaking to each other & keeps posting stuffs on they're myspace saying theyre fake & what not. & Veronica is starting to hang out with a group of girls who we had so much drama with & dosent like us. I told her how are you gonna do that if were friends. Were sppose to be friends regardless no matter what happens. She says *** it Jenny(thats my name) Andrea is the one uming that im flirting with her bf, i dont even like him. & I posted on my myspace saying something about you can never rely on friends and Andrea commented it saying its true Jenny its just me & u now. Then Veronica commented it saying wow are you ur calling me fake Jenny & stuffs like that & i told veronica no but we have to stay together no matter what. Now Veronica & Andrea are fighting over me & i hate it. I just want everyone to be cool with each other, but I just think Veronica is wrong for leaving us like that. Like who does that? She is acting really fake rite now & i dont like her when shes like that but i love her & shes my friend. & im scared that they will end up getting in a fist fight because theyre both fighters. Also, im more friends with Veronica than Andrea. What should i do? I just don wanna loose my best friend to a group of wannabe girls. Please help me i dont know what to do!