I believe this song is about feeling trapped in a relationship where whatever love there used to be has long dissapeared. It would seem as though fiona no longer has feelings for the boy (my feel for you boy, is decaying in front of me) and has left him without feeling any love or regret or pain, just indifference (I've gone away) - no part of her remains with him.
I was trapped in a relationship for years with a man I did not love then eventually when I left he tried to get me back, but he couldn't effect me at all any more, because although the relationship officially ended that day, I had been 'gone away' in spirit for a long time.
I believe this song is about feeling trapped in a relationship where whatever love there used to be has long dissapeared. It would seem as though fiona no longer has feelings for the boy (my feel for you boy, is decaying in front of me) and has left him without feeling any love or regret or pain, just indifference (I've gone away) - no part of her remains with him. I was trapped in a relationship for years with a man I did not love then eventually when I left he tried to get me back, but he couldn't effect me at all any more, because although the relationship officially ended that day, I had been 'gone away' in spirit for a long time.