«The Shape of My Heart» by Ann Aguirre

Some people wait decades to meet their soul mate. Courtney Kaufman suspects she met hers in high school only to lose him at seventeen. Since then, Courtney's social life has been a series of meaningless encounters, though she's made a few close friends along the way. Especially her roommate Max Cooper, who oozes damaged bad-boy vibes from every pore.
Max knows about feeling lost and trying to move beyond the pain he's been on his own since he was sixteen. Now it's time to find out if he can ever go home again, and Courtney's the only one he trusts to go with him. But the trip to Providence could change everything because the more time he spends with Courtney, the harder it is to reconcile what he wants and what he thinks he deserves.
It started out so simple. One misfit helping another. Now Max will do anything to show Courtney that for every heart that's ever been broken, there's another that can make it complete.