you and ni-ki are in a relationship, before you two get together, one of your classmates likes you and keeps flirting with you even when they know that you and Niki are in a relationship.

Niki couldn't stop himself from getting sulky and annoyed because you were still friends with the guy who likes you.

"You're still friends with that boy even when you know he likes you." he said softly yet irritated as he’s behind you waiting as you put all your books inside your locker so you guys can go walk home together.