I am still grieving the loss of what I thought my marriage was and trying to recalibrate in a healthy way. It's difficult to hear my wife say I was a package deal with my family so she could have the family she never had.
It sounds heartbreaking, take your time to grieve what you thought you had. This is a pretty sad place to be in, longing for something we don't have. The bigger the distance between what we want and what we have, the harder it is to live with it. Learning about BPD and gradually come to what we call here "radical acceptance" of the situation can help ease this pain and grief.
Validation is helping but I am now being called on it by my wife and she says its psychobabble and it means nothing.
So nothing unusual there You're not the only one who has gotten that response. In time you'll get better at validating in ways where she feels heard, she will also get used to you doing it, and thirdly it'll become more automatic with more practice. Don't be discouraged!
She tries to tell me my therapist is incompetent and at times will rant about it but I have held my boundary in continuing to go for 6 months now.

Good job! We don't need many boundaries, it can be a good idea to pick just a very few or else we'll end up in a battle field, which is good for no one.