Lyric discussion by ClarinetDreamer 

It's about a woman who realizes that she has let herself become so involved with someone that she doesn't have her own identity anymore. So with this realization, she admits to him that she can't let herself love him anymore, because if she does, she'll only lose her identity more. And that she's strong enough to break away, even though it will hurt her.

Without a doubt, my favorite lyrics are:

And I wont be far from where you are if ever you should call You meant more to me than anyone I ever loved at all But you taught me how to trust myself

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