Hi confused6567,
Welcome

I'm sorry that you are having difficulty coming to terms with your wife's BPD. How did you learn about it? Does she have a diagnosis or did you discover it on your own?
I can guarantee that BPD is not your fault. This is something that begins to develop throughout a person's own life, with the origins starting in childhood. Us Nons may do things that add to the conflict in our marriage (and we have lots of resources to help you with that), but we are not the cause of it.
What would you say is the main issue you are struggling with in your relationship right now?