He gets jealous very easily he hates it when he can't always be by your side because he's busy working. Today you were playing basketball with your friends without realizing Dio was already there watching you from afar seeing you wipe the sweat with your shirt so your abs were visible. It makes him a little uneasy as the women there are hysterical about your body, when the match is over when you're about to wipe your sweat with your shirt, he's right there blocking people's view of you