this song is about loving somebody who can't change, and how hard it is to accept that-- and how hard it is to choose between staying or leaving.
this song is about going minigolfing with your partner and realizing that they've fallen out of love with you- but only knowing how to blame yourself.
this song is about the quote “you are a mosaic of everyone you've ever loved” and how true it rings when someone leaves your life for reasons you don't understand.