Sam, I am so sorry to hear you are in this position! Basically pwBPD have no half measures, you are either all good or all bad. You can read about splitting here:
https://bpdfamily.com/message_board/index.php?topic=62033.0You expressing some doubt about not seeing your parents caused her to split you. The BPD renders her incapable of thinking 'Sam was angry with his parents
at the time' , and instead you are now all bad.
The fact is, pwBPD often try to isolate their partners and separate them from their family. It means there are no witnesses as the non slowly loses parts of themselves. She may have placed a huge importance on the fact that you were not talking to your family and that she would not have to deal with them. There may be a history of bad relationships with in-laws, maybe she has trouble getting along with people? Now she feels cheated, and yes, may be seriously re-considering the marriage because of it. It matters that much to her that you are isolated from your family.
So consider well, going forward, whether this would be good for you and your mental health. Perhaps you may have dodged a bullet? Because if this is a source of conflict now, the dynamics will get much, much worse should you decide to have children together. You might have wished them to see their grandparents sometimes, she would get angry with you and yet you would feel you had no option but to stay for the children's sake. Take a look at the 'Conflicted' board to see many parents like that.
Enjoy the time alone, it is peaceful. And it really gives you a chance to process. Your wife is in therapy, but if she isn't doing the work, she is unlikely to get better. Is this what you want for the rest of your life? How is it taking care of you?
When is your next therapy session? Might be something to get you some support while you work through this tough time.