Is the song only exception based on josh and Hayley relationship?

"The Only Exception" by Paramore is not exclusively based on the relationship between Josh Farro and Hayley Williams. The song was written by Hayley Williams and Taylor York, and it is believed to be about a failed relationship that Hayley Williams experienced. While some fans speculate that the song may have been inspired by her breakup with Josh Farro, Hayley Williams has never explicitly confirmed this.