Hearing that Merlin had been supportive did not entirely come as a surprise, although Arthur was very glad to hear it. He also appreciated that Merlin had not mentioned it before, since knowing it would have made being here without her even more difficult.
Guinevere's reaction when mentioning Morgana was a surprise, however. While it would be an unfamiliar concept for her, as they had both been raised with similar expectations, Arthur would have thought that she would at least be tolerant. Honestly, he would have expected her to be happy for them, once she got past the initial shock. "She did not take it well?" he asked quietly, disappointed.