Who did Taylor swift write better than revenge about?

Better Than Revenge was written about Camilla Belle. In 2008, Taylor was dating Joe Jonas, and when he broke up with her, he started dating Camilla Belle straight after. In other Words, Camilla stole Joe off Taylor.

Taylor wrote the line, 'she's not a saint' because Camilla was brought up as a strict catholic. Joe wrote a song about Taylor called 'Much Better' so Taylor added the Words, 'so much better' into the song.