He was angry, upset that Rhaenyra wasn't going his way, maybe he had expected that, but Daemon wasn't really patient man, He didn't marry Rhaenyra because he loved her completely, also because he really wanted to restore the throne, which is his right. His dragon Caraxes had landed at Harrenhal, this castle would be a support base for their war against the Greens, he spoke with a few lords who were completely useless to him, but his attention was distracted by something else, you. You are the head of a house whose name he doesn't quite know, perhaps this is the first time he has seen a woman like you run a house efficiently, unconsciously he starts to see his eyes drifting towards you every time you pass by him. Perhaps he should have married you, instead of marrying Rhaenyra, who is plotting against him every day, or trying to catch up with a dream that will never happen.