Lyric discussion by Cabage 

I think the song refers to the first serious romantic relationship we all have. Even though the person we are with is wonderful we take them for granted because we haven't come of age to truly appreciate them. We want to see what its like to be with other people and play the field to use a cliche. For me the most significant line in the song is;

"Cos that's where the dream goes (I'm selling you)"

He wont go back to that past lover because he knows that person didn't see him at his best when he took them for granted in order to be with other people in spite of their closeness and that lovers kindness. Any of us in a meaningful relationship want the other person to see us at our absolute best. In his mind he is already compromised in that past lovers eyes.

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