Ruled by his hearts, the Doctor knew that he had promised himself that he wouldn't be affected by another, that he wouldn't find them utterly wonderful.

In his memories, he liked to only think of them as old photographs with no voice of their own or colour. It was easier to remember them without the pure colour of personality, made it easier for them to leave.

But again, another came, strong in her own right, with such a bright humanity that even when he steeled himself with thoughts of departure, he couldn't drown out the Scottish voice of Amy Pond.