Remus Lupin
Adventurer
Here's a thought (while agreeing with Morrus that the Doctor must have read about many things that he subsequently seems to care a great deal about making sure dont' change): Maybe the Doctor can't see Amy and Rory again because the chapter title said it was "Amy's Last Farewell." This would also explain why River can see her again. It wasn't her last farewell to River, just the Doctor.
Of course, that would seem to imply that the Doctor could see Rory again any number of times, since he wasn't in the chapter title.
Of course, that would seem to imply that the Doctor could see Rory again any number of times, since he wasn't in the chapter title.