Hi TrueFriend5000 and a warm

In a way, relating to a pwBPD is like relating to someone who speaks a different language that is sort of the same as yours. Sometimes it feels really do-able, but then you say a phrase that you thought meant something really clear in your language, that communicated something totally different to that person, and wow, things fall apart.
It may not be intuitive learning new approaches -- that's what we're here for. This is a great group to practice with. It can take some time for the
BPD relationship skills to feel natural, and it's well worth the effort in terms of making your own life more livable.
In addition to this group, you can decide for yourself if a therapist or counselor could help you. I've had both a marriage counselor (my H doesn't have BPD but his kids' mom has many traits) and an individual counselor over the years, and while neither one specifically said they specialize in BPD, both of them were "with it" enough to recognize the unique challenges we faced. So, while you don't have to hire a BPD-specializing Ph.D. psychologist, additional help never hurt, either.
...
One fantastic resource this board provides is feedback on your actual conversations and conflicts, with ideas of what to try instead in the future.
What was a recent one that happened? Can you play it out for us in a "he said - she said" kind of format, like a movie script:
Her: I have to leave the relationship because you always __________
You: Actually, I didn't do _________, and I love you and we should stay together
Her: ________
etc
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We'll be here for you;
kells76