The (500) Days of Summer is about a non-love affair (he loves her, she doesn't love him) between two people working in a greeting card company in L.A. He falls in love with her the first minute he spots her. She goes out with him for fun and wants only a non-commitment relationship. They seem very much in love as the affair stretches into many months.  He falls for her hard. She is convinced that love is just an illusion until....  Very cute and quite funny in parts. Great summer movie!