No need to get even with your ex. Just write a song about them and fain indifference when they call you out. Some of the world’s most famous songs were written for reasons other than aiming for a number one hit.
Taylor Swift’s 2010 hit Dear John was a blow to the gut for her ex-flame, John Mayer. During an interview with Rolling Stone, the singer said he was “really humiliated” by the song after their rumoured fling fizzled out before she released her album Speak Now.