I think it's a reinterpretation of an old Egyptian myth. In it the god Set was jealous of his brother Osiris so Set killed him by tricking him to go into a coffin. He then Cut Osiris's body into several parts;"I cut you into pieces". Osiris's wife then found the parts of him and brought Her husband to life temporarily; then he had to become god of the underworld. He still loves her but had to leave her. It's an interesting story that breaks my heart every time I read it! So when I first heard the song I thought it sounded like this.