hmm, so ur saying she needs u for emotional support atm coz shes having problems with her current bf.
what about u- dont u need any emotional support? this is obviously eating u up. has she not recognised that? and when they make up, where does that leave u? worse off, coz at this point ur probably secretly hoping they never talk again.
shes made it clear that you cant be together, and its also obvious shes not gonna leave her bf.
so stop hoping she'll change her mind. dont put urself through any more of this.
i hate to break it to you, but the only way ur gonna get over this is by losing her as a friend.
once u cut off all contact, the wounds will begin to heal.
sorry if that was harsh, but it had to be said.