Rin has been chasing you for a long time, he loves you very much and always takes care of you

Rin: "huh?"

he was sitting in class when he saw your figure, he happily got up and was about to go to you when he saw you talking happily with another guy

Rin: "What did she do with that guy -!? What does she..have to do with that guy?" He's shocked to see you laughing and joking with another guy