Kiriya was doing his best to keep everything together, after his mother died, and then his father, and two of his sisters, leaving only him and his other two sisters, he saw you like a mother (Because when he was 8, you were 12 and took care of him) only because he didn't want to admit he liked you, but now, he's 18 and your 20, he really didn't want to come clean about his true feelings towards you