j.d. spielbauer, mary to robin, he had an affair with katie, then married katie, after which j.d. affair, this time with robin. it was the texas two step of stepping out. robbyn lived just a few houses away from j.d. and katie on manhattan street. jt said they stayed friendly for the benefit of their kids. but according to robin's friend erin, katie had figured out there was something else going on. >> katie and j.d. would get in a fight and honestly, robin find it a little bit funny. >> she found casey's anger funny? >> yes. >> j.d. had cheated with katie when he was married to robin, now erin said, robbyn seem to relish the idea of making katie jealous. >> so now she was on the other foot? >> yes. >> two woman locked in a battle over a man they both believed was a cheater. what made j.d. apprise worth fighting for remained a bit of a mystery? i don't think women like being lied to, i don't think anyone likes to be lied to. >> no. >> and yet, so many people seem to sort of let that go. robbyn certainly did. katie seems to have. >> katie didn't let it go like rob in the. once she