"So she aims it at someone else. If she needs to do that, she will find an excuse or a reason to do it at you." And she only aims it at me. I don't think her husband is getting the same treatment.
When I said "someone else" I meant she is aiming it at someone besides herself. No guarantees whether you are the only "special target" or not.

If she really does have BPD, then I would guess that her husband has been the subject of this sort of behavior too. You may never know.
Right now I am being idealized because she realized that I have been true to her. Sadly one little misstep on my part is enough to take me to be painted black again.
Yes, she is likely to paint you black again. And when she does it, there will be something that she'll start going of at you over. But calling it your "misstep" is missing the point.
In my mind, I view it as the avalanche which starts when you drop a pebble. If there weren't tons and tons of unstable snow and rock for it to land on. Blaming a 1/4 ounce pebble for the whole avalanche isn't very accurate either.