(and now we find out who watches Game of Thrones)
So really, he knew his whole life how it would end.
@mdk Apparently GRRM planned this all out from the beginning, meaning that he's been sitting on it for twenty-five years.
<Snipped quote by Taaj>
I'm not sure he did, or at least not convinced that he was capable of understanding that knowledge or acting on it in any significant way. We'll probably know for sure when it's revealed in the books (in however many months or years that takes).