I Knew You Were Trouble by Lauren Layne

Taylor Carr has it all—a sleek job in advertising, a stunning Manhattan apartment, and the perfect man to share it with: Bradley Calloway. Even after Bradley dumps her for a co-worker on move-in day, Taylor isn’t worried. She’ll get her man eventually. In the meantime, she needs a new roommate. Enter Nick Ballantine, career bartender, freelance writer—and longtime pain in Taylor’s ass. Sexy in a permanent five-o’clock-shadow kind of way, Nick knows how to push Taylor’s buttons, as if he could see right through to the real her.

Nick’s always trying to fix people, and nobody could use a good fixing more than Taylor. Sure, she’s gorgeous, with mesmerizing silver eyes, but it’s her vulnerability that kills him. Now that they’re shacking up together, the chemistry is out of control. Soon they’re putting every part of their two-bedroom apartment to good use. Then Taylor’s ex comes crawling back to her, and Nick figures she’ll jump at the chance to go back to her old life—unless he fights for the best thing that ever happened to him.