It's more like "Forgiveness..." and trailing off as if he can't believe she even suggested such a thing when her own actions have made the very concept alien.
Panel 1 "I forgive you" (I read on, and I don't want to spoil anything, but I believe he really does mean that. As his purpose is something entirely different from revenge, or getting an apology)
Panel 4 "I......" "I was forgiven......?" (Or it could be we, it doesn't specify)