Lyric discussion by Achory 

Yeah, the meaning is pretty straightforward, but I can't figure out how the title relates at all.

St. Vitus' Dance is a nuerological disorder characterized by jerky, uncontrollable muscle spasms of the arms and/or legs that seem to flow along the limbs and cause it to look almost like one is dancing in place. If anyone can explain the relation between the title and the meaning of the song or the lyrics, I would be grateful.

His heart is diseased (depressed for dumping his true love) and/or he is spazzing out (feeling anxiety) for realizing that he made a mistake by dumping his true love for the wrong reasons (e.g., thinking she was after his money).

@Achory What's interesting to me is that I can think of no relation between the title and the lyrics. But the fast, syncopated rhythm of the music makes me envision a person suffering from St. Vitus' Dance moving to that rhythm.

An error occured.