Based on what you have said, I do not think it was BPD. You can check the DSM for various mental illnesses and see what fits.
I don’t think the manipulation is bipolar just the extreme ups and downs. I think the manipulation is something else.
In addition to the DSM, you can watch Kati Morton on YouTube. She is a licensed therapist who also vlogs on various mental health issues. I have found her so informative and helpful.

I agree with thesadgirl that nonprofessionals diagnosing individuals on the internet that they haven’t met is NOT the best way to do things. That being said, I also know the pain involved in trying to assess what happened in a relationship that you put so much of yourself into. I do that too. I try to make sense of it. There is nothing wrong with that. The problem comes when you cannot move on without it making sense.