What happened to moving on? Personally I'm not sure what reason there is to continue this.
Evidence: That's not evidence. It was just a theory of Maya's that was proven wrong.
Then: skip to the end of this reply and you'll see why.
Overreaction: that's your opinion. Factually, she overreacted. She even seems to regret it since it's caused people to think she likes Sensei which of course was not her intention.
Break him: Maya simply tries to tell him something and he sees her as a bird. Noriko and Niki show him things from the past and he regains memories, and even his name. It's pretty clear what memories are bad for him. Maya related ones.
Direct: It's conjecture to think she's telling the truth. Besides that though, It's been shown that she literally can't tell Sensei about the past... So why are you so quick to believe she's suddenly able to? It's blatant she's not actually telling the truth. Otherwise Sensei would have blacked out and seen her as a bird.
Btw, using context to understand things is far more effective than merely seeing words and going with it. Not sure why you think your "direct" and "indirect" comparison is worth noting. If anything, you're indirectly ignoring the big picture by thinking "direct" statements are better(?).
Secret: You assume Maya actually has an experience of Noriko not keeping a secret. Just because someone says something, doesn't make it true.
Anyway, it's been confirmed that Noriko never actually did anything to Maya by Maya and Noriko:
And that Maya was merely afraid of Noriko's existence possibly affecting Sensei:
In other words: Maya's main problem with Noriko and the reason she took Sensei away from her, was simply because of the possibility that her existence would affect Sensei in a way Maya didn't want.
How Maya actually convinced Sensei to abandon Noriko isn't confirmed though.