Ydrys,
You sound very similar to where I was 12 months ago.
She had a history of abusing me and hit me on our anniversary, the 8th of January 2014. Something inside me snapped and I walked out the house, telling her that was the last time she would ever hit me again. I separated from her and left the city.
One year later, I am back in the home after a 10 month separation. She knows very well that if she ever hits me again, I will serve her divorce papers within a week. That's my non negotiable boundary.
She has not changed alot during that time, however she has admitted to Borderline and Narcissistic traits. I have changed tremendously. And my ability to behave healthily in the relationship has grown. This is the important thing. We have the ability to change much. It starts with SET and boundaries, and will only grow from there.
You're doing well. Keep it up! Consistency over time is the only thing that works. BPD is notoriously resistant to treatment, but if we change to healthy, they need to choose healthy with us or leave. The difficult thing is that its impoSible to know which they will choose, but eventually the gap between healthy and unhealthy grows to a point of choice.
It is an uncomfortable gap, but it is our duty to lead it. We are the more healthy of the two, and can change the most/quickest.
What do you want as an outcome of this?
Hang in there. I recognise the pain and the anguish and the sleep deprivation.