After the war, Nico had fled camp to escape his feelings. But when he's taken by his father after a favor is refused, he's saved and brought back to camp by the person he had dreaded to see most. Percy Jackson.
Actually...si the opposite. He loves you how can't you see that!
Jason: Nico likes you. As more than a friend.
Percy: As a best friend?
Jason: More than that..
Percy: As a mega friend?!
Percy: As a SUPER AWESOME MEGA BEST FRIEND?!
Jason: *facepalm* Oh my gods..
Uh huh. Suuuuuuuuure he does.
If that wasn't obvious enough, that was sarcasm.
He says the opposite of what he feels, Percy. It's just his instinct. HE LOVES YOU, BRO. LIKE MORE THAN A FRIEND.
Percy doesn't really learn that sometimes people might be hiding something when around another person.