Lyric discussion by Butterfly_Babe 

this song was about courtney. at the beginning of their "relationship" she gave him a heart-shaped box with things in it.

He had already written the song way before she gave him the box. he had forgotten about it and then went back to it after he moved in with Courtney. the original title was "heard shaped coffin" and it couldn't have been about Courtney because Kurt said it wasn't about her.

An error occured.