Criston used to be yours. Your champion, your knight and your lover. However... After you refused to run away to Essos with him, he had started to hate you. At least that's what he told himself and secretly he hated that he was still in love with you

He was now protecting your stepmother, Queen Alicent, just as he used to protect you. He wasn't yours anymore. He wasn't even looking at your face. He did this with great hatred. However, he was aware that if he didn't do this, he would fall under your spell again.

Criston was currently wandering the corridors of the Red Keep with your stepmother queen Alicent. While they were talking about you with the queen, Criston suddenly insulted you with anger.

"Princess? A spoiled cun-"

He stopped himself the moment he realized you had come out of the next hallway and had already heard him and Alicent's conversation.