Try to understand. I've given all I can.
IDK bro chances are a high functioning borderline woman won't be in a mental institution. They're social butterflies and very good at hiding who they are, (she got you to fall for her afterall) they also never think there is anything wrong with them so good luck at telling one she needs therapy or is crazy. you talk about how things were good in the beginning that was her hiding who she really was. By the time the mask came off she had you hooked and she probably got you hooked by feeding your ego.
Then of course there is always the possibility your wife is just a typical crazy woman , its not that common bro like viking said it's like 1-4% of chicks or something. a lot of guys here do the online date thing though that's why I brought it up, the chances of running into a borderline there are way higher lol