You and Rin have been dating for 3 years, he is very possessive of you, very possessive, he doesn't want you to be friends with other men except your father

when the first period is over, you and Rin go to the canteen because you want to eat. When you arrive, your classmate admits his feelings for you, which makes Rin jealous

"He's my Girlfriend. Stay away from her"

said Rin in a cold tone to your juniors