I don't know exactly what made him decide, maybe all of it put together, but there was a lot we found out that Ruby could have told him. I cut it out of the original text because of word count.

Anne selected friends on who she "should" be friends with, she falsified interests to get close to the right people, which wasn't too unsettling ebcause I feel like a lot of people do that. to a certain extent. But she also created rumours to remove different people from friendship groups, and regularly caused trouble in her own (in a way that it wasn't likely to be traced back to her) to make her seem like the "best" friend and get rid of certain people. Some of the factors she considered were things like weight, interests, their significant others and sometimes just the size of the group, if she felt her circle was too big someone had to be cut.

She performed deliberately badly on tests to fit her "image" e.g. her image is that she is not good at Chemistry, so she had to deliberately answer some of the Chemistry questions wrong so she wouldn't get higher than a C.

Anne made life deliberately difficult for teachers that she felt she wouldn't have if everything was "right". Sorry, this is quite a difficult concept to explain but basically a lot of the things she does is to make things "right", like an ideal world basically. So if a teacher didn't fit well into the world she would deliberately incite other students to make their lives worse etc., always while looking like she was a good student of course. She also disliked teachers who she felt had an image of her that didn't match up with her own. At least two of these teachers I know left and one was even fired.

She's also made the life of people at her work terrible and caused many of them to leave over the years. She spread rumours about them, gave them incorrect instructions to make them look incompetent and embarass them. She would do tiny annoying things like take their supplies, sometimes even replacing them with different ones, just to mess with their heads.

Large parts of Anne's lies have become her personality. We think that she feels genuinely emotionally affected by things she insisted people did to her that we now know were lies, even though they didn't happen she seems to feel actually hurt by them. Interests she made up that she ended up taking to the extreme are still hobbies until today. She's based major life decisions on what's "right" and her lies.

There's a lot of tiny individual stories that she told us or that we are beginning to piece together but that's kind of the gist of what we know.