I think you need to tell him that the child support is not money he is giving you. It's for the kids, and it's necessary for you to support them. What would they do without it??
As far as the rest, I hope he doesn't get defensive. I mean, I'm sure the blush is off the rose with the OW, but if YOU call her a bimbo, he's just going to lash out at you.
I suppose it's possible he's grown up a little bit now, though.
M: 16 years Bomb 4/07 OW 20s long gone Divorced 11/09 I remarried New Guy Cooperative r w/X regarding D