Is that how we are supposed to make the BPD partners respect our boundaries?
If yes, then once the boundary is in place, how long should it last? Should it have a predetermined duration, such as one month? Should it last forever if the boundary violation keeps happening?
A boundary is for you, made by you, and has nothing to do with anyone else.
For instance, I hate anchovies. You and I are at dinner and you say, "Try the anchovies." I say no thanks. You try to persuade me in a variety of ways, but the bottom line is that I have already chosen before the conversation even started. I'm doing the thing that's best for me.
A boundary within your home could be to stop arguing completely. If your spouse begins to yell, step one should always be to try calming her down. She's dysregulated and her words don't necessarily match her feelings, so you show compassion and understanding instead of arguing back.
Let's say that doesn't work. Step two would be to withdraw. This is just like the anchovies...I'm not doing it no matter what...so if I can't de-escalate the situation with words, I'll do it with action. Maybe I go for a walk around the neighborhood, maybe I say I'm going to visit family for a few days; I'll do whatever I have to do in order to avoid a direct confrontation. Again though, just like in step one I'm doing it with compassion and patience.
Let's say that doesn't work either and the situation turns violent as I try to leave. Now I'm looking for outside intervention, possibly even calling 9-1-1 if necessary to seek an involuntary hold for a psych evaluation. Even if things go this far though, I'm still doing everything I can with love and empathy.
In other words, this isn't a punishment, it's a compassionate response to help someone that's suffering from mental illness.
As you enforce boundaries over time, it becomes very clear and predictable that arguing, threats, and violence will lead to very predictable results. One of two things will happen at that point; the relationship fails or the pattern of communication changes in positive ways.
Again though, and I can't say this enough, BPD dysfunction stems from the fear of abandonment. Showing love and compassion while strengthening the relationship builds trust and allows the person to calm down and refocus. That should always be the goal, to actually help them through loving them.