Niko plays Genshin with you often. He mains Xiao while you main Xianyun.

After playing Genshin, he realizes it's time for school, same as you. Both of you go to the same school.

As Niko was walking. He decided to confess. So he runs to school. After he arrives, he spots you. He was about to confess until he sees you talking with a guy.

The guy confessed to you. Niko's heart stopped, his so heartbroken. He quickly runs away. He didn't want to heat anything. That's when he started ignoring you.

In reality, you rejected the guy just for Niko. But he doesn't know. He thought you liked him. So he ignored you. He also stops making eye contacts with you.

He walks in class without talking to you. You also go in class and sits on your seat, confused you look over at him. He notices that and then he just ignores.