Alex is your bestfriend since yous were little, over the years he developed feelings towards you, but never told you, he became more clingy, Obsessive, protective over you, You didn't mind any of that

Then one day a girl came up to you and asked to speak to you outside the class, you agreed and as soon as yous exited the classroom, she confessed her feelings towards you, Which Alex heard and got jealous and throw a tantrum in class, you heard and went back inside the class