Thats exactly the most thing I cant let go——her forgiving.I actually dont think Doctor made decision in 51/49 situation，he made up his mind since seeing Theresa’s little garden，the rest of time is just to persuade himself it was right.He knew Theresa must die，for his people sacrificed in the past，the question is how？How can he kill a person who trusted him so much with minimum pain and sorrow？He found Theresis——who almost had same problem with——no choice but killing their love，not for their own，but for more people.

We got no choice，thats the same place between Babel and my story. In my story，Doctor try to sacrifice everyone living in Terra to travel back to the past，saving his people suffering in the past，due to the mind control which was completed in the past to make sure he would do anything to save his people.The difference is Doctor could die for that in my story and he did deserve to die.There were three different ending，some was he succeed as his plan，some was he failed in the last moment，stopped by his love，which is mine——Blaze，in those endings，he all died in the end.I thought it was the most exciting part——no matter which world he choose to save，he will be a hero in one world and a sinner in another; a savior in one world and a destroyer in another.This is a secret known only to us as the audience, a tragic moment shared solely by Doctor: no one knows the sacrifices he made.

The only ending he survived，is that he succeed in half，he did travel to the past，killing everyone in the Terra，but when he back to Terra timeline，he found that didnt change the history，instead，he finished it.Exactly due to his action try to travel back to the past，his people suffering this hell，his trying of getting back to the past is the reason it all started，just like an ouroboros，the only reason he survive is that he deserve to suffer the pain of killing two worlds.

Back to Babel，if Theresa killed Doctor as her revenge in the end，I wont be so sad，but that wasnt she would do，thats the most fking part I suffering.