I would love to be able to get to the stage where I could have the conversation about a future, boundaries in place and invite her along too.
With pwBPD you "say" much more with your actions, than you do your words.
You get to "say" the things you want, she gets to choose to listen or not.
If you use the tools right... .there is a very good chance she will "hear", which does increase the chances she will make a choice you will like.
Step 1 is to take a dispassionate look at your relationship, through the lens of the knowledge you have gained from this website and perhaps therapy. Once you have an accurate view of your part in the "dance" of your relationship, especially parts that are dysfunctional, YOU can change that part.
99.9% guarantees the other person to change the way they dance in the relationship. We can't pick exactly how they change or what the new relationship will look like, but if we (the nons) are being healthier, very likely the r/s will be somewhat healthier.
Wash, rinse, dry... .repeat. Making sure that new changes are always towards a healthier place. Eventually you will get a better idea of where the r/s can really go. From there you can make an informed decision if you want to stay in it.
For me: I've figured out that if our marriage relationship is more distant, a bit aloof, there is a lot of stability in our family, especially for kids. Not want I "want", but certainly a good life where I can raise good kids.
Note: Being aloof keeps her more towards the "pull" side of things, which is generally less abusive than the "push" (get away from me you creep) side of the r/s.
FF