The Perfect Sister by Leanne Davis

Ally McKinley has been told how perfect she is so often that she now strives to live up to that ideal. Her father abandoned her family when she was a just a kid, but it taught her the importance of taking care of herself. She must keep everything around her under perfect order and control to avoid ever again being so blindsided. Her type A personality helped her sail through school and her college years, but that merely reinforces the positive aspects to being so perfect.

It also prevents almost everyone from ever seeing who she really is.

Nate Stratton attends the same college. He is in the same grade, majoring in the same subject, and even shares family with Ally. Ally is smart, funny, sarcastic, and, to everyone else’s eyes, the perfect college senior, about to take her world by storm. Nate, however, finds Ally’s need for perfection ridiculous, especially after he learns the secret he’s pretty sure no one, not even her sister or mother, know about her. Her secret threatens her health as well as her life. He thinks she is taking a stupid gamble to uphold her illusion of perfection. What good is striving to be perfect if she never allows herself to feel anything real? He intends to show her that imperfection is far more interesting than trying to live up to an ideal that might ultimately kill her.