Hi there, Jason!

I'm glad you've found us. We're a supportive community with a lot of tips and experience to share. And we really "get it."
That is a very tricky situation you're involved in. People with BPD tend to have very strong abandonment fears and lack of trust can be a biggie as well.
May I ask, has your wife been diagnosed with BPD? Not that it matters underneath. Many here are in relationships with people who don't have a diagnosis. Just having some of the characteristics and symptoms is enough. I was just curious what type of therapy she's in.
I understand that your previous infidelity probably triggered her lack of trust and gives her something real and concrete to point to. As you said, though, you should not/cannot admit to something that isn't true.
Has she ever threatened to leave before? How have you responded to her threats and demands and accusations?