He should definitely tell the truth to Moody. Harry's inexperience has caused him to overlook many things in the past and this is serious enough to get someone with actual experience to look over the facts. Voldemort probably had other plans in motion and other agents carrying out his will.
And Moody can be counted on not to go blabbing to the others, undermining Hermione's status as the new hero, or so on.
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 117.
Plans for next chapter release:
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.)