It's great you broached the subject of increase child support with ExH, but don't let his "calculations" or reasoning dissuade you...consult with an L, lay out all the facts, and see what they say you are owed. That's the only way you'll truly know what a court would likely rule. With that knowledge you can negotiate a fair deal.
If you're feeling really devious leverage his affair with his W's best friends against him. A little subtle poke there might persuade him to be more reasonable ;-) But seriously...at least consult the L. What do you have to lose, an hour of your time and $100-200?
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
