I can imagine The Doctor saying "Her name was Donna, Donna Noble. She was the most brilliant, most clever and most important woman in all the creation, but above everthing, she was my best friend, my partner, my sister... then, I lost her..."<< Did you really have to do that? <<< " I made her forget. She didn't want to, but it was for the best. It'll kill her if she ever does remember. My Donna... I miss my Donna... But she's okay now. She's safe. She's married. She's happy. Without me."