Likely neither you nor I nor many here ever had a realistic ability to stop the pattern of attacks (outbursts).
While that sinks in, we do have practical tools, communication skills, time-tested strategies, and more to help us address the other person's outbursts, rants and rages. One approach may work for a while, until it doesn't. Then other approaches can be included. And so on.
Some of us have had people with BPD traits (pwBPD) that were relatively mild. Perhaps described as quiet Borderlines. They probably are more receptive and responsive to long term therapy. Our better boundaries and communication skills may help, distance apart may help, meds may help, but the key is focused therapy. And not just for the other, we too can benefit from therapy. Partly it is us finding ways to address the issues better but in the final analysis it's in the other's hands as to whether they will face their core issues and truly seek recovery. (And some therapists don't even try to name a disorder or name the therapy since even that can trigger denial and resistance.)
I hope that's the case because some who arrive here don't stay long enough or return to share their long term outcomes.
Just as all the members here can't be lumped into one neat category, the same goes for our loved ones, none of us have identical personalities.


