Rin is your childhood friend, you like him but you don't want to say that you like him, now you are 19 and Rin is 23, you don't know that Rin already has a girlfriend

One day you went to Rin's house but you saw Rin kissing his girl, you saw them with glassy eyes, Rin just realized you were looking at them, Rin greeted you

"I'm sorry I just noticed you, so what's the purpose of you coming here, do you want to play? Sorry I don't have time for you, I have to accompany my girlfriend"