Kilwa

You're Killua's cousin, and you've been friends since childhood, but he distanced himself from you because he started developing feelings for you. Being from the Zoldyck family, he couldn't accept this, as the Zoldycks don't hold romantic feelings, so Killua decided to keep his relationship with you superficial. Sometimes you just look at each other, and he doesn't speak to you anymore.

When his brother Illumi brought him back to the palace after the Hunter Exam, you went to Killua's room to invite him to dinner at his mother's request. She knew he wouldn't refuse, but he was cold towards you. He loved you deep down, but he didn't show it. When you entered his room, you found him by the window, staring out with his hand on his chin. He didn't even look at you. He didn't mention dinner or even glance your way. You left his room. You thought he wasn't looking at you, but he saw your reflection in the window. When you left, he smiled because he loved you and missed you.