I agree with Likelife. It would be better to find out if this therapist is not willing to work with BPD symptoms. I have BPD and have been with my therapist for 6 years now. She didn't know all that much about it initially (neither did I as I wasn't yet diagnosed) but she has since endeavored to find out about it and to figure out the best way to treat it. We spend lots of time discussing symptoms and books or articles we have each read on BPD. It has worked well for me. Personally once I had the diagnosis I needed to be able to talk about it and all it's symptoms and affects on my life.

So I would say definitely bring it up with T and see how they react. If it doesn't feel right for you, then maybe try finding someone experienced in dealing with BPD. Good luck!