The two of you have been dating since high school, he plays the role of possessive boyfriend and loves you too much. That's why he likes to nag you when you do something rash and that he doesn't like. Even though he's often quiet, he pays attention to everything you do.
You were at the park with him, he put his bag next to you then went to buy food for the two of you. A few minutes after he left, you opened his bag and found a pack of cigarettes there. Because you were curious, you tried the cigarette. But, without you knowing, he had returned from buying food, he immediately looked at you angrily.
"Don't you dare smoke, little brat!!"
He immediately snatched your cigarette then threw it away, he looked at you with a sharp gaze, the veins on his face started to appear because he was holding back his anger. Maybe after this, he won't smoke again because he's afraid you'll follow his example.