Thank you wantmorepeace. It hardly feels like progress where putting the boundaries down results in more aggressive escalations and emotional violence that cuts deeper and deeper to try to get the same reaction.
In the good moments she gets vulnerable and even owns some of the mistakes, says she just wishes that i would open up more so that she would know when she's hurting me and she'd know to stop, and then when the bad times return I'm actually naive enough to believe this and it gets me sucked in deeper into the arguments to a point where she can hurt me again.
It truly feels like all vulnerability right now is ultimately a self destructive action because it will reliably be used against me in the near future. I feel like a fish on a hook, where the good moments are just meant to lure me to relax before string gets tightened again and eventually i run out of power to fight.
It may help to take an objective look at these behaviors. All behaviors persist because somehow, there's a payoff or benefit to them. It's how all living creatures operate- with positive or negative reinforcements for behaviors.
PwBPD have difficulty with their own emotions and so project them on to others, other situations. The anger episodes, dissociative rages, serve a purpose, to get these emotions out. After they are out, there is also a period of calm and relative clarity. These are the times where she appears able to recocile, apologize, make things better.
These are the times you feel more hopeful, inclined to discuss the situation, seek some reconciliation. IMHO I would not tell her "how much she's hurt you". This, with my BPD mother, would trigger shame in her. Shame feel intolerable, and she'd disssociate into a rage. It's worth saying this to someone who is capable of managing their feelings- as it might lead to understanding, but when someone is not and they dissociate from it, it doesn't change anything because they can not process it. You know how much your wife can or can not manage hearing this but my BPD mother could not.
The pwBPD may feel a sense of relief after an episode but those of us who also experienced this do not. However, the pwBPD may feel better, act nicer and so there's the all is well idea and do not bring up what happened assumption.
You have been helping to manage your wife's feelings for her for a long time. Your recent change in how much you do that has led to what is known as an extinction burst. To try to get you back to doing what helped before is a normal behavioral response. Your task is to maintain your changes through this.