School murderer

A story about a girl who's father is abusve and gets bully through out school. One day for some reason she get popular? And finds someone whom she thinks is different but they always cheats on her. Every guy she's been with has always cheated on her. And every time she finds out they cheat. one day her new boyfriend confessed that he's been cheating. She's tired of it all tired of goodbyes, tired of begging them to love her. But she decides to stay with him but he still cheats so she guesses that she's replaceable. She then proves all of them wrong and they shouldn't have don't that and even brakes up with her currently boyfriend. Her father is still abusve but she finally loses control. Her daemon side broke. She was done giving mercy to them all she started with her dad. Then the whole school. When the police finally came it was too late she was burned down the school with herself inside.
Willa - main character -. Most people who are more than 2 magical creatures is usesaly an outcast.
Damon - main characters ex and lover - James cheated on Lilly too many times he was the reasons Lilly got popular. But it was all his plan cause then she'll be the laughing stock of the school. He pretends to be the good guy but he isn't.
Dark- main characters father- dark is very abusive he believes that Lilly was the reason his wife died.