Lyric discussion by dropsof 

losing a limb is often used as a metaphor for losing the one you love. The sortof, "you feel like part of you is missing" thing.

I saw it a bit like a relationship that they have to keep hidden, and have to act like just passers by in the street- possibly because he's gone onto fame (hence the "It's not my fault I don't care I don't regret a single thing") and she doesn't want the limelight that comes with having a famous boyfriend.

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