I think this song is about a girl dying in a car crash. However, it may have been suicide because of the lines, "But you knew all along" and "You laugh the light / I cry the wound." This person could be laughing because she wanted to die and got her wish. The lines "Where is your heart? / Where is your heart gone to?" express the singer's sorrow over the heartlessness the girl had, to kill herself despite the fact that he loved her.
I think this song is about a girl dying in a car crash. However, it may have been suicide because of the lines, "But you knew all along" and "You laugh the light / I cry the wound." This person could be laughing because she wanted to die and got her wish. The lines "Where is your heart? / Where is your heart gone to?" express the singer's sorrow over the heartlessness the girl had, to kill herself despite the fact that he loved her.