Bruce gave a small smile when she expressed concern over growing feelings. He very nearly chuckled. He was about to reassure her when she grew more serious again.
He smiled down to her, but there was a hint of sadness to it. Sadness that he had given her, or himself, cause to doubt, maybe, or sadness at the changing roles they had to face. But he nodded, his hand still in her hair. "I know," he said softly. And after a moment, "Thank you." For reminding him.