I also understand and I think Philomel, at some point feels ready to talk it out and forgive the emperor. See that she’s worried about him and all but once she realised that he knew she was there at the door (during her childhood) but still saying all those things, I totally understand if she dont want to ever forgive him. He intentionally harms her (mentally? emotionally?). I think her feelings are valid, she dont need to forgive anyone if they dont deserve it.

I feel bad for Eustis but I'm also glad Philomel didn't forgive him. It wouldn't be possible to forgive him. But I get where they both come from so it's hard.