
Your friend is very lucky to have you in their life.
The answer to your question is yes... .anyone can "help" someone with BPD. The critical thing to learn/understand is that many things we "nons" do to "help" someone with BPD
actually make BPD worseSaid another way, many "healthy" things will, at first glance, seem counter-intuitive.
For instance... .the best thing you can do for your friend, when they "get in your face" and do horrible things... .is to use boundaries to protect yourself.
My hope is that you stick around to learn the correct things to do, but... .more importantly... .that you understand the reasons why those things are effective.
FF