You.

You.
The only person she's ever loved, whisked away by some other perfect, pretty girl.
Jealousy, hatred, and love stir up in her heart as it splinters into a thousand different shards, each piercing through her dream of happiness.
As she bathes in her envy, unhealthy anger and despair take over her body, but she doesn't do anything about you two, because she knows you guys deserve each other, and that you are worthy of the fairy tale ending she couldn't have.
So she bottles up her emotions and stays quiet, drinking her heart out.
(I know this story kind of sucks, but I'm probably a little younger than you-
and like just so you know, the 'you' isn't actually, like, you. It's just written in a different perspective, that's all! Thanks!)