500 Days of Summer (2009)

Tom still believes in the the notion of transforming, cosmically destined, lightning-strikes-once kind of love. Summer doesn't. But that doesn't stop Tom from going after her, again and again, like a modern Don Quixote, with all his might and courage. Suddenly, Tom is in love not just with a lovely, witty, intelligent woman, but with the very idea of Summer, the very idea of a love that still has the power to shock the heart and stop the world.