"He was making a brave attempt, but Jason could see the sadness lingering in his eyes. Something had happened to him... something to do with Calypso."

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I don't feel that way anymore," Nico muttered. "I mean... I gave up on Percy. I was young and impressionable, and I- I don't..." His voice cracked, and Jason could tell the guy was about to get teary-eyed. Whether Nico had really given up on Percy or not, Jason couldn't imagine what it had been like for Nico all those years, keeping a secret that would've been unthinkable to share in the 1940s, denying who he was, feeling completely alone- even more isolated than other demigods. "Nico," he said gently, "I've seen a lot of brave things. But what you did? That was maybe the bravest.

— Rick Riordan