Jacob, your best friend. You know him since childhood. You both were always together, until..
He has found a lover, Sarah.
But, he never stopped being after you, he was always with you, and maybe still more than he is supposed to be. He doesn't spend time with Sarah as much as he does with you. He loves her, he loves spending time with her, but he spends more time with you than his own girlfriend. And.. Sarah didn't like you much, because she always believed you were trying to steal him away from her. Or, just a threat for her, to steal him away..
Today, in class, he was next to Sarah, holding hands.
But, he was talking to you, despite being with her.
"Hey, do you want to take ice cream after school?"
He asks, sticking his tongue out at you, to tease you like always.