Hmm, a tough situation, although it doesn't have to be. But Sigma it seems has Rho pretty much where she wants him, in that she gets the attention and affection she needs with pulling the stunts she does. Is this relationship so important to Rho that he is willing to risk alienating both his wife, his friends and his other love Pi to accommodate Sigma?
She has her own baggage to deal with, but with everyone else, especially Rho, dancing to her tune and catering to her insecurities, she doesn't have to do the work required to start unpacking that.
Is it possible to get Rho on this board to explain why this woman has him so under her spell? As things now stand, I don't see any reason for Sigma to change her behavior any time soon.
Me: bi female in my twenties