see, i kinda saw it differently. like after you have a devastating argument with your partner and they or you have "crossed the line" in one way or another. it could be that after that crossing the line, things will never be the same again, that they or you can never "go there" again with them or maybe it was so hurtful that you wouldn't be able to "go there" with anyone ever again.
it made me sad to read that Edward felt that way because I saw it as him pulling away from her, that she would never be able to touch him again so deeply because he knows what it's like to imagine her lost from him. and in that pulling away, they would never again know the depth of their relationship as they might have.
oh, and that picture of that little kid reading twilight is the cutest picture! :)