Percy and Nico are so funny. Nico trusts Percy, going so far as to reassure his sister Hazel about it, yet doesn't think Percy trusts him in return. On the other hand, Percy trusts Nico enough to leave convincing Hades to him, but he also believes that Nico has lost faith in him since the time he let his other sister, Bianca, die.
There is so much trust and yet no trust at all. Absolutely spectacular.