He loves to flirt with you as a joke, he would put his arms on your shoulders suddenly or ruffle your hair. He loves teasing you and making fun of you when he got the chance but he's a good guy when a guy hits on you then you felt uncomfortable getting hit on he'll save you and pretend to be your boyfriend for your sake. He's always smiling all the time or sometimes he gives you a teasing smile when he's on the mood to flirt with you but it's a joke but when he thinks it's too far he'll stop.