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"No, I think it's fine like this, I have died long ago, and I was unable to protect Naiad. I failed to do so… I don't really want to speak with these people, I would only feel shame," Eustace sighed.
"Oh well… I guess I get where you're coming from," I nodded. "Let's leave it be then…"
I suppose he really didn't want to expand into this subject anymore. Maybe he was indeed still mourning Naiad. It was better to leave him be, he had already avenged her, and lived as a ghost only to help Celes.
I think he might eventually pass away peacefully once Celes grows up, he probably only wants to see him grown up and strong before moving on.
I had almost forgotten why ghosts exists to begin with.
"So that's how it happened," Lucifer nodded. "I see, Naiad's sacrifice was very noble, and she will live in all of your memories, as she lives within our hearts."