Remember Me Forever by Sara Wolf

Isis Blake hasn’t fallen in love in three years, forty-three weeks, and two days. Or so she thinks.
The boy she maybe-sort-of-definitely loved and sort-of-maybe-definitely hated has dropped off the face of the planet in the face of tragedy, leaving a Jack Hunter–shaped hole. Determined to be happy, Isis fills it in with lies and puts on a brave smile for her new life at Ohio State University.

But the smile lasts only until he shows up. The menace from her past—her darkest secret, Nameless—is attending OSU right alongside her. And he’s whispering that he has something Isis wants—something she needs to see to move forward. To move on.
Isis has always been able to pretend everything is okay. But not anymore.
Isis Blake might be good at putting herself back together.

But Jack Hunter is better.