system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] Why did the 11th Doctor think he would die on Trenzalore when he knew there was at least one more incarnation of himself?

So when all doctors were saving Gallifrey, surely the 11th doctor must have have noticed that there 13 versions of himself there. He might have not known that was his next one but you would think he would assume "Oh hey, I guess this isn't my last regeneration" But how come on Trenzalore he just assumed this was the end. I know time can be rewritten, but he acted like he never knew.
gpt
The timelines were out of sync. Even if 11 had happened to notice 12 was there he would have forgotten about it. Just as 10 is told he'll forget his interactions with 11, 11 will forget he ever saw 12.