That could explain the anger. There's still a lot of detail about the bedroom, though you could assume that Quirrel used legilemens on Flamel to find the truth about the stone. That seems really direct and dangerous, but Perenelle may not be an occlumens at all, and from Ch. 86:

"And I'll warn you of this but once. Voldie isn't like any other Legilimens in recorded history. He doesn't need to look you in the eyes, and if your shields are that rusty he'd creep in so softly you'd never notice a thing."

As DavidAgain pointed out above, there seems to be a parseltongue statement against tricking the map as well.

Something is still off about this, though. Suddenly Quirrel is spinning a romance narrative? Also, here is a clever, ambition student, who in her 6th year outwitted the most powerful dark sorceress we know of and obtained for herself an ancient immortality-granting artifact. She sought immortality while still in school, as Tom Riddle did, and with greater success. She leveraged her advantage over greater wizards than herself to obtain more power still. She has shown so many traits that Quirrel would admire, and what adjectives does he use to describe her? Covetous. Black-hearted. If the betrayal were personal, I can make sense of that, otherwise it seems really off.

The Quirrel I know would mostly stick to the facts, perhaps stopping to note the stupidity of Baba Yaga and the cunning of Perenelle.

Maybe his negative view of Perenelle is just because she helped Dumbledore. Maybe I'm reading too much into too little. I'm in love with the theory though; I hope it works out.