Another thing that I noticed with my exgf is that what they say may have nothing to do with anything you've done at that time. It could be that she was annoyed by something days earlier and it has built up until a point she needed to vent and then I become the trigger by doing something minor.
The catalyst may have been a friend, a stranger, a family member or even something I had done. There really is no way of knowing what exactly is trying to be communicated. You have to try and look at everything and see what may be relevant to the current situation.
I never knew about BPD but now looking back Ive re evaluated a lot of the things my ex said and it has painted a completely different picture.
enlightenme has made a great example. Often times, whatever they blow up over is just a feather that landed on the teetering emotions they were already harboring.
When something comes out of left field, try to step back out of the situation. Make yourself an observer and a listener. Do not listen with the intent to reply or defend yourself... .it will do no good. Listen for the intent of picking up the clues of what is at the root of their discomfort.
The things my husband accuses me of when he is dysregulating (when he is clear, he knows this is all false fear) is almost always either the way he feels about himself, or what he thinks I should think of himself. Does that make sense?
Like, he doesn't work. He's on disability for his BPD. He cannot hold a 9-5 and I don't expect him to. Yet, he hates himself for not working. He feels like he's not a real man, and he should be doing more.
Since he feels that way, when he is dysregulating he will accuse me of looking to upgrade husbands and it's only a matter of time before I kick him out. He will accuse me of being stupid because I am with him and love him.