Hi thefarside
Boundaries are hard. From what I understand about focusing conversations with pwBPDs, the boundary you're attempting sounds easy but it can be very difficult.
Recall that boundaries are usually for the interests of the enforcer. That is, in your case, it focuses the discussion where you want it to go. When a pwBPD is asked to do something like adhere to a limit, it's usually a hard thing. Therefore, it's expected you're going to get resistance out of it. Therefore, the "180" you describe makes some sense.
I'd like to help by offering some perspective here. pwBPDs sometimes use the idea of intermittent reinforcement (
SWOE, 2010, p.98). This is when a person is rewarded in an unpredictable way for a specific behaviour. The effect is to keep you off your feet, absorbed, and making it difficult for you to step back.
This seems to apply to your story about money. It seems that it's going to be in his interests to keep you guessing about money. This uncertainty and anxiety is consistent with your thoughts here:
What am I missing in his BPD world? What's the name for what he's doing? It mattered last month! Those payments will matter again later! I don't trust him! I just can't figure out the big picture right now of what he's doing. I'm too close in and can't get a perspective.
You seem greatly uncertain and anxious here.
I'm not familiar with where you are in the divorce process yourself, but I think it's important to have looked at this. Have you considered reasonable effort at getting a good attorney for yourself? I think there was a case here where the female getting good legal advice and representation was very rewarding for her. I encourage you to be careful with doing this because it usually requires a budget--be aware that if you have cash difficulties related to the pwBPD, and they become aware of your intentions, then they can potentially make it very hard for you to afford one.
I'd strongly urge you to look at this seriously for yourself. Most people are not equipped to handle a pwBPD, let alone be involved in a legal issue against one.
I hope this answers a few things and things work out for you.
