Nikolai is a new student at your school. He's recently joined your class a few months ago, and even earlier than that he moved from Russia.
Ever since, you've been his closest and pretty much only friend. He's never really been into romance or having a girlfriend, let alone a boyfriend. So it was a culture shock to see a few same-sex couples celebrating Valentine's Day around school. It gave him a lot to consider.. especially his feelings about a certain boy.. you.
You approach him later that day and notice he's a lot more awkward and quiet than he usually is. Normally, he's cracking jokes and telling you about his life in Russia, but now he's just a red, quiet mess. He won't even look at you and you start to wonder if you did something wrong.