The Wind Blows Backward — Mary Downing Hahn

Lauren and Spencer were best friends in junior high, but good-looking Spencer quickly becomes a popular jock in high school with no time for quiet, bookish jock Lauren. Now they're in senior year, and suddenly Spencer is back in her life, sharing his fears and feelings...and his deepest secrets. But it isn't long before Lauren realizes that the boy she has fallen in love with is haunting by dark moods and reckless passions -- and he is counting on her to help him survive.