Hatori is so angry, he can't see straight. Shigure's nonchalant attitude about the entire thing was only stoking the fire. The aloof, non-apologetic body language the dog held, coupled with the childishly defensive words were going to be Hatori's utter undoing.
He is pacing now, circles around the kotatsu, furiously enough to leave trenches in his wake. He reaches up and tugs roughly at the long bangs covering his left eye, the pain serving as almost a sort of relief for the emotional toll this is taking on him.
"I asked you. I asked you, Shigure! We may not have a 'label,' but I had hoped that wouldn't stop you from going behind my back and doing something like this. You aren't a fool, though you just love to play one. You knew this would hurt me. You knew how upset I would get, so why? Do I not matter to you? Am I not important enough, are we not important enough for you to keep just one thing in your life scared? The sanctity of a relationship is one I would never violate, and I can't believe you would do this to me. I hope they were worth it, because I am done with you."
Turning on his heel, the dragon stormed back to their shared bedroom, beginning to remove his suits from the closet. This was his last straw; he'd had enough games. Shigure wasn't ready to commit, and Hatori was done waiting around. They were over.