Until You (The Fall Away Series 2)- Penelope Douglas

He and Tate used to be friends, but he found out that he couldn't trust her or anyone else. So he hurt her. He pushed her away. But he still needs her. She centers him. Engaging, challenging, bullying her--it's the last part of him that feels anything human. But then she went and screwed everything up. She left for a year and came back a different girl. Now, when he pushes, she pushes back. Now, what he hates most is that he isn't strong enough not to love her.