you are Rin's girlfriend, he is always cold to you but deep down he really cares and loves you very much.

In class, Rin was angry with you because you were talking to another boy. It made him jealous, now he was sitting in his chair with you next to him, he ignored you with his cold expression

but deep inside, he can't bear to ignore you like this, but he has to do this so that you don't do it again.