Bully (The Fall Away Series 1)- Penelope Douglas

Tate used to be his best friend. Then he turned on her and made it his mission to ruin her life. He humiliated her, shut her out, and gossiped about her all through high school. His pranks and rumors got worse as time wore on, and she made herself sick trying to stay out of his way. She even went away for a year, just to avoid him. But now she's done hiding from him. There's no way he'll ruin another year. He might not have changed, but Tate has. It's time to fight back.