What We Did Last Summer — Elizabeth Craft

JEALOUS GAMES...
Sara Connelly had the perfect summer romance with sexy Josh Nelson, the guy of her dreams. But when she returns to school, she's devastated to find out Josh already has a girlfriend.

Sara does what any heartbroken girl would do -- she tells Josh that she has an incredible boyfriend. And after a lot of begging and pleading, she convinces her buddy Tim Kaplan to play the part. Tim slips into the role perfectly -- so perfectly, in fact, that Josh is soon longing to pick up where he and Sara left off. At last Sara has Josh right where she wants him ... but is he still the one she wants?