Eh, she's going to be living a lie. If she finds out one day - I can easily see the Vow causing that, if nothing else - that'll be horrible.
And if she doesn't, that'll be another kind of horrible. Especially when Harry started as a "truth is sacred" guy, and I don't think that, for all his experience since then, he's done a complete reversal on that.
I imagine that Harry can tell her the truth in a few years, after they've saved the world, and she's learnt more, and there's just more distance from the event. But I don't know if she'll be fooled that long, or conversely if Harry will ever be willing to tell her. I'm more inclined to think that the Vow might prevent him from telling her, if he's worried that she won't be able to offer him good advice afterwards.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 116.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)