"I think what you're not comprehending is that I was alone when I destroyed Gallifrey, just like I was alone for the Time War. He'd run off to the end of the universe. You keep talking about how horrible it was in the aftermath. Misery shared is misery halved, yes? Double it. Double whatever hell you had. Add in the Dalek's killing a man who loved and trusted me and the first bright thing I'd seen since Gallifrey pouring the Vortex into him and fixing him in time. Then have her fall in love with me, trust me, and have the Dalek's take her away from me, forever, again.
"Finding out even after that, they still weren't really gone. Thinking I'm alone and then finding some version of you at the end of the universe, and trying to save you. For months, over and over just trying to save the only thing there was left. Asking me how it felt, did I feel like God, did I enjoy it? Watch him warp humanity, tear and destroy and kill and desecrate earth. Watch him destroy a man who loved me and waited for me, again and again and again, and watch that man keep coming back for more, incapable of even finding peace in being dead because I saved him for the Daleks to kill and to be condemned by the good intentions and love of a beautiful, idiot human girl. Keep TRYING to fix a madman because he's what's left and keep watching him reject it, right up to the point of DEATH. Then clean up his body and watch it burn, just like Gallifrey burned. Watch Jack and the newest, devoted, brilliant young girl walk away from you because they can keep fighting for earth but all you've got left is the certainty that sooner or later the monsters will come out of the dark. No stability. No understanding. No hope. Just you, all of space and time and the knowledge that sooner or later they'll be back and anything you have found is going to be ripped away in a flash of blue light by a filthy, disgusting, flesh eating disease of the universe."