Lyric discussion by bovi says 

I don't really know what the whole song means but I do know that this version is from the album ALIVEACOUSTIC and the version from EISENHOWER doesn't have the second verse about addiction. I think primarily the song is about the singer (which may or may not actually be Brad Barr) who supports a female who doesn't open up (someone comes along you continue to rust), and expects it back.

Whether or not he gets the support back is up for discussion.

The version on EISENHOWER is better to me because there is a slight note change from Dust to Rust and in the version on ALIVEACOUSTIC the note for both words is the same. Listen to it, it is subtle but there.

Either version is great!

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