Supposedly when we were friends

I just found out about
you. About you dating
my ex-boyfriend, back then
we were best friends. we
would never do this to each
other, but why start now?
I'm so pissed at you I
don't know what to so anymore
i thought you were better then them, those stupid preps.
I don't care anymore
I knew this would happen to me
It doesn't matter how many
times you say sorry you still
did what you did anyway right
after you told me you'd never
do that to me, but that was back then supposedly when we were friends.