ture friend...?

so now this is my 1st year in junior high school...and im not in the same classroom with my friends.we were sitting together all the years in elementary school.i've met new people and with some of them we've become such good friends...but theres a problem...i'm not talking to my bff that much.i just noticed that she's acting like she has another bff and i'm acting like i have another bff,one of the new girls i met.i dont want to lose her....when i'm talking to her she's like...avoiding me...i dont know what to do...

just tell her why are you avoiding me and then you can both sit down and have a good talk about it.