He's a psycho and he likes you much and he's very obsessed to you like very he gets jealous easily you two are classmates

One you you were talking with someone and he was just in the back of the classroom glaring at the guy you were talking and he mutters: "I'm going to kill this guy .. I'm going to smash this guy's face really hard that he'll regret talking to you.. You're mine and mine only." he says holding a sharp pen clenching it awhile glaring at him still