This definitely looks staged as it was too synchronized, aka how her dancing looked choreographed, how they go to the back of the stage and the curtain falls, etc., but women will do all of this and more at concerts.
Give your woman the notion that if she gets on a stage at a concert or its over. All of that 'it's just a performance. He's just a celeb so nothing will happen' nonsense has to go out the window. If she wants to go because you didn't leave the door open for her to publicly disrespect you, open the door and let her walk out of your life. Your respect is 100 times more important than the temporary company of a hidden ho that will end up making your life a nightmare down the line.