My general interpretation of this song is that she's afraid to take that final step with the one she loves. So she keeps her walls up but it puts her in a lonely place where she can be safe in the knowledge that he won't get close enough to wound her but at the same time she won't get to have the thing that she craves and fears.
My general interpretation of this song is that she's afraid to take that final step with the one she loves. So she keeps her walls up but it puts her in a lonely place where she can be safe in the knowledge that he won't get close enough to wound her but at the same time she won't get to have the thing that she craves and fears.