Hi Movingon6
Welcome to the family.
It is hard to understand how we could have been so off on our judgment. A lot of it has to do with them mirroring us and some is because we want it to work so we ignore the warning signs.
My exgf probably ended up the polar opposite of who I thought she was.
There are some useful lessons on the leaving board
https://bpdfamily.com/message_board/index.php?topic=136462.0It might be worthwhile for you to have a look at them.
Please keep reading and posting. I think you will be surprised how many people here have been through what you have and seeing this can help in not feeling alone in it. It also helps when you start doubting yourself as a lot of us have done. It helps to realise were not the "crazy" ones that we can sometimes feel like.