I've been following your thread and agree you've been hit by the worst kind of hurt but are doing well.
I've been where you are. Twice, with the same husband. The first time, after 20 years of marriage I stupidly played the pick me game. And he came back. That was the biggest mistake of my life. I welcomed him back because we were having a very hard time with our elder son and I thought stability would be good for him. But of course he did it again, 10 years later. It was the worst time, but I knew that was it.
In some ways I feel I gave it my best shot and shouldn't regret taking him back, but honestly, it was a bad choice. First time around our children were early teens, and he offered me with a generous settlement. Second time around it was just as he was due to retire (on a gold-plated public sector pension) and he fought for every penny, to the degree that my solicitor commented on how miserly he was.
He followed the same pattern most middle-aged adulterers do. Both times he left for women that were in situations that made him look like a knight on a white charger. In reality he's weak and easily led. The only time he was strong was fighting for money.
My advice? Try not to see him or even speak to him. It goes against all your instincts, but a clean(ish) break is easier in the long run. Get his stuff out of the house so he has no excuse to come back. My OH asked for his stuff, then complained when I packed all of it and left it outside, as he only wanted enough to keep him going. Tough. He didn't get to choose.
Prioritise what you want from it all. Mine was the family home, as I still had two young adults at home and it felt safe. It stood me in good stead, providing security and doubling in value after some work (that ex-DH had considered pointless).
Try not to be drawn into any bitter "abandoned wives" clubs. There were women at work who were convinced all men were bad and wanted me to join their little group. Honestly, it's not a happy place, don't get sucked in.
When it all happened I was convinced I'd never be happy again. But my kids encouraged me to get out there after a few years and, to my huge surprise, I met the loveliest man and am now happily remarried. 2 of my 3 children haven't seen their father since he left, and regard DH as their father, and grandfather to their little ones.
Life now is very good. And it can be for you too. You have your self-respect, your children and good friends. You can get through this. The future may not look the way you expected, but it can turn out to be even better.