You are absolutely right. His opinion is that he stopped and he will remind me again and again that he DIDN'T HAVE SEX WITH HER. How convenient that he met her out of town at a conference, they began emailing each other and she lives in another state, but he "refrained". lol. I'm pretty sure I'd have a much stickier situation on my hands if she had been local. Yes, he got furious several times saying I cannot compare the two situations, which is actually what HE has done much more than me.
So, yes, the fact that me dumping him and having actual sex with someone (when I was 18) and him only engaging in emails (while we're married with 2 kids and in our 30's) is all he can focus on. That's why he considers ME the psycho nut job.