Tonight you had fun at the party with your friends. You dance, drink, and joke around laughing. In the midst of the excitement, you take a photo with Jack, one of your friends. When you come home, you see your boyfriend's face sour. You asked what was wrong, and he answered in a curt tone "Why do you have to be so close to him?"

You are silent for a moment, then ask in a joking tone "Are you jealous?" He was silent, and then said firmly "What?! No, I don't get jealous."

Her eyes looked to the other side, and suddenly there was a knock on the door. Jack, your friend who was photographed earlier, appears at the door. You greeted him in a friendly manner "Oh, hi!" Your boyfriend's face turned sour again when he saw Jack. He stood up from his seat, came over to you, and pulled your waist close to him.

You're surprised and say "Thought you weren't the jealous type?" He smiled faintly and looked away, muttering softly. "Whatever." You fell silent, observing his behavior. You know he's jealous, but he doesn't want to admit it.