He knew.

From the beginning, I knew that the time Pond were in his life was ending. He realized he had lost the gas they had in their youth. They were getting tired of running. They could no longer stand the pace of the Doctor. They would not be the first. Nor Rose, nor Martha or Donna achieved. And Amy and Rory would be no different. Was there a time when they would leave. And the Doctor felt that this time was coming, even though he insisted and said openly that they do not.

He hated finals.

Everything had gone so right. They had managed to create the paradox and continue living. If they did not looked at the gravestone, if they had not stopped to watch her, the angel would not have touched them. The doctor would not have lost both. The pain of seeing Amelia give their last farewell broke his heart that maybe, this time, he lingered a little longer than normal to recover. "Come along, Pond" he said, and suffered a single time, but she did not hear him. For Amy for anything worth a life without Rory, a life running, running away from all the ghosts and all reality that surrounded her. That was what the Doctor. He had succeeded, but she knew she would not have been so successful.

And so, she turned, giving his last goodbye to his ragged friend.

He could hate the finals, but he never was able to prevent them from happening.

(And time can be rewritten, but sometimes he finds a way to put everything back as it should be)