Just read through your entire sitch. I think it's great you came back for an update because for me (and I assume others) it's always so great to see the longer view of these sitches instead of it just falling off after R or D.
You must be 45ish now and D17 and S13? How have your kids managed through it all? How is your marriage with your HS girlfriend (assume that's the widow with a kid of her own you started seeing)? Any contact with your ExW? How's she acting these days...any attempts to R, has she gotten more reasonable parenting?
Also...incredible stories from your childhood and growing up. You certainly have life experiences most don't. Sorry you had to go through all that stuff with your parents. moving around in bad situations. Did you ever discuss your path with your IC and how that might impacts your relationships?
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21