This is a general question, but spins off my thread here: https://bpdfamily.com/message_board/index.php?topic=338831.0
It's a matter of understanding the guilt cycle and how it plays out. More importantly, how to work past or through it.
I know that pwBPD's experience strong guilt and internal self-devaluation, just as they project and subject others to. Likewise, it seems admitting wrongs, taking ownership of things, and apologizing are difficult for them.
My wife is that way and the way I describe it is that it is like a see-saw: when I am painted black, the guilt is projected on me and she essentially idealized herself. Then, shifting to idealizing me, she voices how horrible she is as a wife and how amazed she is I've stuck with her "despite [her]

." She never voices *why* she is "horrible" or *what* her "

" is, so it's an indication of self-devaluing and guilt, but never actual voiced ownership of whatever she blames herself for.
I am sure fear of abandonment and associated fragile trust is at the center of not being able to come out with anything. "If I own it / confess it, will he/she leave? Will I be vulnerable to that threat? Or the threat of voicing it causing more damage?"
So, it's held in. Without putting it out there for forgiveness of others, it adds up. It becomes more and more fodder for negative self-talk during periods of self devaluing and I would guess that the more guilt is carried inside, the worse the PBD can get.
Question 1: How true does this sound and what input or observations do people have about the guilt factors and how it affects or amplifies things?
Looking at that, I look at an aspect of my situation (see thread link for details), which is that this person who WAS trustworthy and had integrity no longer does. It's a "fib or half truth becomes a lie and the lie grows into a monster" scenario" played out with two things, I believe. Being a person who had prided herself on not lying, she stuck herself in a position and is, I believe, living with that on her conscience. This coincides with the worsening of her BPD over the past few months and a lot of damage and aot of projection.
I'm in a position where, to move forward, it is an obstacle. It does need to be faced - for me and the relationship, but also - I believe - for her, because even before this I'd sensed she's so weighed down inside with self-blame for things held in and never let out. Yet, her trust in me is very low, some due to my own actions and reactions, but I think a large amount is projection (including the projection of "NPD" which came our in what stopped short of full accusation, but obviously reveals her view).
Question 2: Especially factoring in her NPD projection and really fragile trust, but generally also the mechanisms that make it difficult to open pwBPD's up to seeing and voicing wrongs or dishonesty they don't want to face... how do you work past this to address something that has grown and grown to threaten the relationship (a self-fulfilling prophesy)?
I'll save you reading by summing really briefly in a reply below, if it would help to have an idea of how I am applying it.