On the outside, Twelve is a very gruff character, but he is one who attaches himself to a few people and loves them intensely. Friends (Missy and Clara) or enemies (Missy and Davros), this is a character who wants to save the people closest to him more than anything, but people will always take their own paths and choose their own destinies. Clara’s death and his desperate fight against it gave the Doctor a lesson in letting people go and letting them make their own choices. Then, the end of the series returned us to River Song, the woman he saved to the Library all those years ago because he could let go of her either. As he interacts with her, we see how far he has come from the beginning of series 8. He loves, he laughs, and he lives happily, even if not forever, because, as River says, “happy ever after doesn’t mean forever. It just means time.” So he seizes the time he has with her instead of fighting desperately for his impossible dream of having the people he loves alive and in his life forever.