Lyric discussion by LondonSkyline 

This is the song my username comes from!

I take it to mean that Amy has a relationship of some sort but the other half is out with someone else, hence the chorus. And she's not the promised land, meaning that she isnt going to sit around for 40 years while this person finds their way back to her. Just another song caused by heartbreak in a non-monogamous relationship...

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