Preparation for the extinction burst should be this period of you modelling extreme measured calm and generosity towards them.
Any subtle devious way of throwing petrol on it to increase its ferocity should be considered.😁
Certainly binning/donating some bits in the house that he may value, but of course denying completely, can be good for stressing the hell out of twats.
Not valuable items, just of value to him!
As people they do not know each other.
They were shag partners that suddenly got together.
His preference would have been going back and forth between you both, in his egocentric delusion.🙄
Both of you vying for him.
You cut that off, so they are two people living in her space that are together a lot, with all the normal petty irritations and annoyances that undoubtedly brings.
The winter is long and dark to be stuck inside with someone who gets on your tits.
Christmas will be challenging.
As discreetly and as calculating as you can, ensure he is excluded from as much as is possible.
Have some gatherings in your home that he can hear about.
I presume he is still barred from returning? so you busy yourself with planning some lovely evenings with your children, their friends and the inner circle.
I certainly hope your friends will ensure he is included in any gatherings at their's.
Hopefully it will be a quiet holiday for them.
In your place, anyone that entertains them, should go in the friend bin, absolutely no second chances IMO.
I have absolutely no tolerance for "balance" in these situations.
You are either a real friend or you are dead to me.
Loyalty or I am not interested.
Christmas is a time of past memories of other Christmases.
Let see how this one pans out as he views the future ahead.
I think while his denial is dragging it out, the full reality of just how enormously he fucked up will hit him.
Do not be surprised at all at a really bad dose of anger at his very poor choices, to morph into him sinking into a BIG depression.
For flying monkeys to be "genuinely worried" about him.
Be ready for it because he may try and manipulate you and your children with this.
Ultimately they are not a love match, so they will not last.
However, they will cling together for a while, for him for housing alone, but he will be whirling around in his head trying to figure out his next move, and how he can come out of this not smelling of dung!
Oh and when the extinction burst does arrive, your position/expression should oscilate between, faux shock, faux pity, faux regret, faux fxxking concern......while protecting yourself from any time alone with him.
You are doing great.