How did Dr. Jekyll respond to the disappearance of Mr. Hyde?

At the beginning of Chapter 6, we learn that "time has passed" and no one has been able to capture Hyde. Jekyll, however, free from the evil influence of Hyde, has become a new man. He entertains, devotes himself to charity, and is highly sociable. In early January, Utterson attends a dinner party at Jekyll's home, at which Dr. Lanyon is also present. All were jovial and friendly, and had a wonderful time. Only days afterwards, Utterson pays Jekyll a visit and learns from Poole that the doctor has secluded himself and will see no one.