Why did he do it you ask? It was the only way to stop them all. The daleks and the Time lords, all as bad as one another. That is why he did it. And every waking hour, it haunts him. The fact he allowed himself to wipe them all away almost drove him insane, just like Morbius and Rassilon of old.
He suppressed me and allowed Sadness, Disgust and Anger to take control. Sadness for the grief he was suffering on the inside. Disgust for the contempt he felt for his own actions. Anger for the unfairness of the whole situation; why was he not taken along with them? What evil entity was playing cruel games with the Doctor? Why could he not rest in peace?
Alone in the universe he was, and alone he stayed for a very long time. I wasn't needed, not then.
Fear didn't need to come out either, seeing as there wasn't anything to be afraid of anymore. Not in the real world anyway. There was the occasional horror lurking in dream productions and whoever was on dream duty would deal with some of it, but often enough it came down to Fear to sort out the mess that was caused. But I still wasn't needed much. Why would a Time Lord so riddled with guilt have a need for Joy in his life?
For the last few months we have been trying to numb the pain, visiting new worlds, saving civilisations from a host of threats, quite often of their own doing...oh the sorrows of the universe have been so underestimated.
With the doctor only recently regenerated, I began to think to myself that perhaps this could finally be a change for the better, we have been hiding for too long. We could visit an old favourite place of ours, somewhere we haven't been for a long winds were a changing once more, I could feel it. And maybe, just maybe, he could finally be happy again.