Nico before Bianca's death: 

Wanna play some Myth-o-Magic? WOW! Your really the son of Poseidon?! I love you sooooo much Bianca!!!

Nico after Bianca's death: 

I hate you, i hate you, oh hey will. Get away from me, I am the Ghost King * intense scowl* That's not my type- SHUT THE HADES UP PERCY!