Attachments by Rainbow Rowell; as un-put-down-able as Daniel Glattauer's Love Virtually and Every Seventh Wave. Sweet and heart warming. Enough to give you the warm fuzzies but sad enough in parts to make it real.
Where She Went (If I Stay by Gayle Forman. Adam, now a rising rock star, and Mia, a successful cellist, reunite in New York and reconnect after the horrific events that tore them apart when Mia almost died in a car accident three years earlier.
I Was Here (Reprint) By Forman, Gayle Cody found out Meg, best firend, was found dead in a motel room. As she pack up Meg's belonging she finds out there was a boy with a secret and an encrypted file in her laptop.
The Time Traveler's Wife by Audrey Niffenegger. The story of Henry, a time-traveler who has no control over when and where he disappears through time, and Clare, his wife. The time travel aspect adds an interesting twist to a really sweet love story.