How we cite our quotes: (Chapter.Paragraph)
Quote #1
The king gave his arm to the queen, she rose from her chair as gay as if she had been enjoying watching her husband flirt with me; but as he turned to lead her away she paused and her blue eyes looked long and hard at me, as if she were saying goodbye to a friend. (2.166)
Mary and Queen Katherine have an unusual relationship. Mary is very young as one of the queen's ladies in waiting. Perhaps Katherine sees Mary as a daughter, and that's one reason why she feels so betrayed when Mary has an affair with her husband.
Quote #2
"Sir, I am sorry, but I love the queen. She's a great lady and I can't betray her." (2.203)
This is an interesting reason for not sleeping with someone else's husband. Would Mary have reservations about being the king's mistress if she didn't actually like the queen?
Quote #3
At once [the queen] looked to me, her sharp gaze accusing me of betraying her most intimate secret. Minutely I shook my head. She looked for Anne in the dancers and saw her, with George's hand in hers. Blandly, Anne looked back. (5.72)
Anne doesn't care about betraying the queen, so she never tries to deny it. Her non-denial is pretty much an affirmation.