"Show me your true form!" Persona 5 roleplay

"You big liar!"

(A) and (B) were together, they just didn't want anyone to know about it
Most of the group was there to get a look at the target of course (or forced to do some kind of act in a palace maybe) but, (A) and (C) were specifically told to act as a couple during the adventure for, some reason or another ..which, okay, set (B) off a bit but, they were fine. Throughout the mission though, they got progressively more jealous of the 'happy couple' due to (C) seemingly trying to get with (A).
Long story short, (A) tries to confront them the next time they met up and things go south, bringing one person after the other into the room and soon, everyone knows the pair are dating.