ytriffy has got it. The narrator is looking upon someone who must go through a transformative process ("return your suffering") in order to become atoned for past acts. It sounds from the personal attributes given by the narrator ("we laid so long, eternal night" & "We won't fit right like it was before"), it seems to have been a personal betrayal upon the narrator by the individual the narrator is referring to.
ytriffy has got it. The narrator is looking upon someone who must go through a transformative process ("return your suffering") in order to become atoned for past acts. It sounds from the personal attributes given by the narrator ("we laid so long, eternal night" & "We won't fit right like it was before"), it seems to have been a personal betrayal upon the narrator by the individual the narrator is referring to.