Don't try to answer her helpless call,
She can't hear your words she feels nothing at all.

And the fourth deepest wound and the love that it killed.

One kind of person can "feel nothing at all" but can relate to others sufficiently to inspire something like love which then might be killed -- one with Narcisistic Personality Disorder. People with NPD can seem very caring and affectionate (in fact they grossly inflate their emotional attachments calling casual acquaintances "dear friends") but in truth they "feel nothing at all" for anything but themselves. They are profoundly solipcistic and consequently live in profound loneliness. It is practically impossible for them to maintain relationships, their personality disorder being a wound that must eventually kill love.