Forever Mates by Grace Brennan

Hannah Vanderguard is trying to change her life. After coming home to Eagle Creek with broken dreams, she’s fighting to become a better version of herself. But one incredibly sexy man is infuriatingly intent on putting her in her place, and reminding her of who she used to be.
Chase MacKeltar doesn’t believe for one minute that Hannah has changed, certain she’s going to hurt the women in his family. The fact that she’s the most beautiful woman he’s ever seen plays no part in how closely he’s watching her. Nope, not at all. He’s just on his guard, trying to protect his family.
But when Chase’s suspicions begin to falter, and Hannah earns his trust, Chase becomes the one with the secrets. And when tragedy strikes, it might already be too late—not just to tell her what he truly is, but also to win her heart forever.