Batman: The Animated Movie - Mask of the Phantasm

Millionaire playboy Bruce Wayne has returned to Gotham after several years abroad. While visiting the gravesite of his parents (if you'll recall, Bruce vowed to devote his life to fighting crime after his parents were killed by street thugs), he meets Andrea Beaumont. By day, the two become involved with each other. By night, Bruce struggles to find the right way to fight the rampant crime of Gotham. A visit to a cave underneath his family's mansion gives him the idea for the costume that would send shivers through the heart of the underworld: Batman. At the same time, he is drawn to Andrea, and does not want to sacrifice his life every night when he could be at home with her. When he determines the path he wishes to take (and it's not the one you'd expect), she disappears without a trace.