Was he happy that she had given Lucius her blood in the first place, no. But unhappy did not even begin to cover the fact that she wanted to give more. He realized that before she didn't understand what blood meant to vampires and how he had felt about it, but just that she had wanted to give more. He stood up again, going back to pacing the length of her bedroom. He was mos upset with himself than with her at this point.
"I know you want to help, Buffy, but please just stay away from him. Let me handle things." He doubted Morgan would want to get involved anyway, but he could do something to help without throwing Buffy to the wolves.
"Alright starting right now, no secrets." he swallowed, that would be harder than he thought and he knew it, but it was the only way they could start to heal. "You have to tell me what stupid little ideas are in your mind and we will talk about them. Let me help you."