Lyric discussion by voodoodolly 

I think it is about a couple separated by distance, and now that the man has returned home, the woman is pushing him away. He still knows the "secret her" that has not changed, but she has a fear because she no longer knows him. But she smiles and pretends to be okay. Then at the end he acknowledges he changed, as he "got too big" for his old life (while on tour in a rock band maybe....hmmm).

@voodoodolly I think this is a good interpretation.

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