Sick Pleasure by Jessica Serra Huizenga

Hazel Blake loves Tristan Sharp.
Tristan Sharp hates Hazel Blake.

There is only one word to describe Hazel Blake and Tristan Sharp: history. Intense, painful, passionate history. (OK, four words.)
But it’s been over five years now and Hazel’s ready to leave the past behind. Having nobody but an absent father, a crazy mother, and a preoccupied brother means she could really use her old friend again. So what if she still has deeper feelings for Tristan? She knows she majorly screwed things up and doesn’t deserve him anymore, so she’ll settle for anything he might be willing to give—even if it’s just his body.

When Hazel comes storming back into Tristan’s life, opening all sorts of old wounds, he wants nothing more than to get to the forgetting part. But he’s also having trouble with the whole forgiveness thing, too. When the girl you love rips your heart out and tosses it around like a beanbag, it tends to change a guy. But nobody gets under Tristan’s skin like Hazel, so he just needs to get her out of his system, right? Hit it and quit it. For good this time, and nobody ever needs to know.

Yes, everything that went down between Hazel and Tristan is in the past.
Too bad history is about to repeat itself . . .
What happens when you love the person you hate?
Can people that hurt each other heal together?