Loving the book recommendations, have loads on reservation from my Library now (Libraries are great - most are set up for children now too).
Also loving the Saturday night away - I did that occasionally after ExDH moved out - if I was at home there were dozens of chores to be done, things making me more anxious. Needed blank space, clean bed, fresh horizon to do a reset. Enjoy!
And also loving, OP, that you are still engaging with this thread. I can't speak for everyone else but I'm so invested in your story. My ExDH did the same to me - "I just want to be single" - although I found he'd been messaging another woman in the months beforehand, and his phone records showed messages to several other women in his hobby group. And our (only one) DS had literally just finished University, so no childcare issues.
Have a super, special, weekend.