Help!

Straight, school life, black and white about this girl(mc) she likes the ml and asks him to date her, he's basically like "nope no thanks" but after a bit I don't remember why he agreed to but he agrees to date her (I think for a certain amount of time)

After a bit of them dating, he starts getting jealous about random stuff (basically just huffs and puffs to himself about it). I think something made the girl upset, and he comforted her and told her that he does actually like her. That's all I remember