What are some coping mechanisms with respect to borderlines? Perhaps the first and foremost is acquiescing to their craziness. One learns to walk on eggshells. It seems better than standing up for yourself using facts and logic. In any case, one cannot win. You are the present villain in their life story, and that is where you will stay.
Is there any chance of them getting better? Unlike many other psychological disorders, the answer is almost always no. It is a sad fate. Whatever it is that makes them that way, cannot be reasoned with, cannot be therapied out in any way.
What to do? As harsh as it might sound, the answer is to, if possible, go away. For your own sanity, and also kinda for the borderline’s. As you are the present object of their contempt, it is best for both sides to remove that object.
It should be noted that borderlines fear abandonment perhaps more than anything else, yet their behavior once the switch turns on, is almost guaranteed to make it happen.
One might wonder how all of this isn’t obvious to the players involved. Well, the borderline can’t see anything but the distorted view of reality that they have encased in their brain. The others are just plain confused because the borderline keeps them off balance, perhaps sometimes intentionally.
Very often a cycle happens, wash, rinse, repeat. If the borderline has enough attractive qualities, she can bounce from fella to fella. Eventually the attractive attributes wane, then it is who know what. But it was sometimes fun, and always exciting.
One type that a borderline can maybe make a go with it would be a narcissist. They wouldn’t operate in walking on eggshells mode. This is kinda what a borderline needs, though it really isn’t enough. Perhaps if there was a enough hot sex and financial support going on, it could be enough. Hint — I have seen it.