"It didn't hurt as much before I came here," the Doctor said quietly. "Hurt, but not as much. Could ignore it, focus on the current companion, on what needed done. Come here, and she's here, and she's alive, and she didn't push me away, I didn't fail her, didn't break my promise to Jackie. And it hurts again." He leaned against the wall, tilting his head back against it. "Avoiding her, actually."