"Do you think he is cheating...?
Namjoon, do you think he is cheating on me?" Jimin asked namjoon.
"Jimin, to be honest, I don't know if Yoongi is cheating on you or not, I'm sorry." Namjoon answers jimins question.
Yoongi never imagined himself being in a relationship until he's questioned by an Interviewer about it. He then starts to wonder why the thought never occurred to him, up until now.
Which leads Yoongi to start questioning his love life and his role as a friend.