Sherlock understands, probably better than Ted realizes. When his relationship with Watson was in its infancy, he had hid his experience with Irene from her. And when she had pursued the information he was furious. But the fact of the matter was that it was the right thing for her to know. With the knowledge she could better help him. With the knowledge they became closer, stronger. They were all the better for it.

"We finished the case around four in the morning," he answers. "Jilted lover in the police department."