3 Degrees Colder(2006)

Marie is in Spain with her friends Frank and Steini looking for her missing dream man Jan. Frank discovers him on a lonely beach, but does not reveal the secret, and the three of them return to Germany. Five years later, when Frank is now married to Marie, he discovers an unsent letter to Jan at her place and forwards it. Jan returns home and initially lives with his parents, but when he finally meets Marie, she has to make a decision.