A quick update of sorts. My partner is out with her son; I have a few hours to myself.
So she didn't self medicate with alcohol on Tuesday as I predicted. What panned out was a very clingy version of her. We can go a month or more with me not being able to go anywhere near her; with total indifference on her part to my mere presence. The past five days have been pretty good. We have been working together and any slight BPD 'trait' which has arisen has been snuffed out effectively mainly by validation. My partner has expressed remorse over her recent 'dysregulation'/violent outburst. Not only have we been getting on, the sex has returned. But is isn't all happy days...
Last night my two sons had a massive fight. It started over my eldest son loaning $70 to my youngest son. While I was having a picnic on the bed with my partner, my youngest calls out to me. I tell him to wait, I am busy. Then the eldest wants to talk to me. I go out into the kitchen and they are having this argument about the $70. My eldest says he gave his brother $100 and owed him $30 from the week before. The youngest says he only gave him $70 and will only pay back $40. I try to be the umpire. I don't know what went on and how much money was exchanged. I suggest they be accountable for their own cash and not have a need to borrow money and if they do maybe they should put it in writing.
So what has this got to do with anything?
Well this massive fight suddenly broke out. My youngest autistic son swings a punch at his brother. They become locked in a wrestle and go down on the floor. Youngest son has his brother around the neck. I start yelling at them both to stop, then join in to get youngest son off his brother who cannot breathe. It all goes to crap. Youngest son goes in his room and eldest son starts blaming me. "You are a

parent... why don't you do something to stop the

which goes on in this house?" He then starts screaming how much he

hates my partner. How she is a

up mental case and causes all the

in the house. How he can't have a relationship with his own father because of her.
I try to remain calm. He just gets worse and is crying. It's pretty bad really. What a sorry state of affairs. He cannot understand how I am 'oblivious' to it all. He is 27 years old and by all rights he should move out of home and live his own life. But there he is telling me I am an

hole because I want to leave the country end of next year and return to England. I tell him I am in my 50's now and I want to have my own life; that there are things I want to do/need to do. He tells me I am

and what sort of a parent abandons their children? "Ok. That's enough... we will talk about this tomorrow"...
I return to the bed picnic and my partner is gone. Thankfully she just went for a walk and it didn't escalate into a full blown disappearing act. The only one who disappeared was my edest son, to his friend's place. But boy did I get an earful when she returned! Apparently she is leaving me now. I have betrayed her. I didn't stand up for her. She heard everything my son said and now she has proof: I b!tch about her behind her back.
Somehow, (and I did get angry at her in the exchange of words) she calmed down. I validated pretty hard mind you. I told her if her son had said those things about me I would be very hurt and probably wouldn't stick around, particularly in light of the fact I had always been nice to him. What didn't work was trying to explain he was angry and didn't really mean what he said; that people often say things in anger that they later regret. She went to bed and pulled the covers over her head. I gave her a few minutes alone then got into bed with her and snuggled up. There was even intimacy.
I don't know how this is panning out. Just when I think her behaviour has a pattern; when all BPD people I read about here sound like my partner... she acts unpredictably. Maybe she is managing things better on her side? Perhaps I am saying some things which resonate? She may come back in an hour or two and I'll be her worst enemy (again).
I continue to read here and will update for the benefit, amusement and amazement of others and myself.