Identify a song lyric or movie line about breaking up?

HELP! This is driving me crazy. I suspect this is part of a movie, novel or maybe even a song. It’s about a guy who is breaking up with someone for the 2nd time and this time he’s the moving party. His speech is something about breaking up, walking away and this time when he looks back over his shoulder he hopes he sees tears in her eyes. Sounds ruthless, huh? Can you help me id the source?