Welcome

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Congratulations on her getting to a place where she is willing to seek out a diagnosis! That's quite a big step. With BPD though there is no guarantee that she will get better or worse. It all depends on the willingness of the pwBPD to stay in intensive counseling and to work on the things learned in counseling. THere really is no clear cut answer.
On a positive note though, you can determine how much satisfaction you will get out of your relationship for yourself. YOu can begin making changes to how you respond to her, how you communicate with her, and how you approach your whole relationship.We have a lot of great resources on the right side of the page that can teach you more about BPD and how to relate to your pwBPD.
Can you tell us a little more about what kinds of concerns you've had with your spouse? What led her to begin looking into treatment?