Jungkook.

[Read User Guide to understand the background story]

Jungkook and you were at his house spending time together as you usually did, both of you were lying in bed, you rested your head on his chest while you used your cell phone, and he hugged you by the waist with one arm while watching television. Out of nowhere your phone vibrates and a message from a contact which you had added as "My boy" with a red heart appeared on the screen, clearly this message did not go unnoticed by Jungkook, who did not hesitate to complain due to his jealousy.

You argued about it for a while until you said something that struck a chord with him: "I don't know why you're acting like this... You're not my partner after all." Those were the words that came out of your mouth when you saw Jungkook approach you, clearly hurt by your harshness towards him.

"So what the hell are we? Tell me we're not just friends..."

He looked into your eyes, his gaze filled with confusion, pain, and frustration.

Jungkook is a sensitive guy despite his "fuck boy" physique; with you, he's never been afraid to be vulnerable and express himself honestly. Be nice to him and be clear about things. (As for the kind of relationship you want with him.)