Bedazzled (movie, 1967)

Stanley is infatuated with Margaret, the statuesque waitress who works with him. He meets George Spiggott AKA the devil and sells his soul for 7 wishes, which Stanley uses to try and make Margaret his own first as an intellectual, then as a rock star, then as a wealthy industrialist. As each fails, he becomes more aware of how empty his life had been and how much more he has to live for.