The song has two verses, repeats the chorus five times and then gives the chorus an instrumental reprise.
Given this is a breakup song where "our" guy expresses just how sad he is there is a huge problem that he has no convincing argument for them as a couple. She is the only one who knew him yet they have nothing in common except a film she thinks she remembers. She might not even remember the film. She might be thinking about something else entirely. If you, dear reader, ever find yourself in a situation like this you should be filled with joy to be free of a relationship that never stood a chance of lasting. It is never, ever appropriate to write a sad repetitive song about the experience.