Doors
It's probably the worst argument they've had yet.
He hates when she flirts with other people, men or women.
Even if it's a ruse to get information or resources.
Even when he's asked her to do it.
So it should have been no surprise that the sight of his Mirage talking and laughing very intimately with the poor stupid arrogant man who's slated for an encounter with an Omnidroid tomorrow, nearly sent him through the roof.
It went on for almost an hour, shouted obscenities and blunt objects sailing across the room, and every delicately cruel slur she can think of, striking everywhere he is most sensitive, until she stormed off, trying to convince herself that a shock of fear is really just anger, to this empty room.
As the door, carefully and thoroughly locked, is torn free and tossed casually away to knock down another wall, she remembers a little too late that he sees closed doors not as hints, but as challenges.