The Doctor was glad to be able to travel again. Though he would miss them. He did hope he could visit again. That depended if he could find them, but also whether he was free to. The universe always needed him.
He was looking at the sky and thinking of what he would do. He had no companions. Nobody with him to tell him where to go. He was afriad to ask anybody else to come with him.
He didn't want to loose anybody else. IT was too painful.

"Thank you again." The Doctor replied "For everything." He took the antidote with him. He hoped nothing would happen to them. He ended up hugging them all. He had basically started to consider them friends.
"Take care." He smiled,
He headed to the door of his ship and grinned "And may we meet again some day."