He's a psycho and he's obsessed to you he will do anything just to keep you all to himself he like slay the person you talk after or, he snaps the person's neck once the person is out of your sight

One day you were talking about the people you talked before and he was watching from looking at the person infront of you muttering: "she's mine mine only" hiding on the corner and after you talked to that person and you left he quickly grabs the person's arms and snaps it's neck*