The Summer I Slept With My Boyfriend's Brother

During their final summer before college, Lily is devastated to discover that Finn, her boyfriend of four years, is having an affair with her best friend, Serena. Following a head injury, Lily seizes the opportunity to fake amnesia. To clear the way for his new romance, a selfish Finn absurdly convinces Lily that his older brother, Connor, is actually her boyfriend.