"The path I carved through time and space, from Gallifrey to Trenzalore. My own personal time tunnel, leading back to every moment I ever lived. Every step, every tear, every kiss. Even the days I haven't lived yet. Which is why I shouldn't be here. The paradoxes... very bad..."
But remember the Doctor's face in this scene. He is not overjoyed at the reunion. He is shocked at what his companions have become. Martha Jones, willing to destroy her race to save the Universe, just like the Doctor. And Rose Tyler, cheering it on. They have become reflections of himself, and it pains him.<---- pinned for the comment