Sweethearts by Sara Zarr
This was a wonderfully sweet and sad book. I loved the relationship between Cameron and Jennifer, best friends in elementary school until Cameron mysteriously moves away. They were each others only friends. Jennifer is led to believe, by her peers and a bit by her mother, that Cameron is dead. She goes about reinventing herself into Jenna Vaughn in high school; a thin, popular girl with friends and a boyfriend. The complete opposite to her former self. When Cameron comes back, she must deal with the past and present colliding.