OP left out a few things:

1) She neglected to mention that her husband told her because he thought it was funny that his ex blew up at him, not simply funny that he contacted her. 2) She also neglected to say that her husband said, from the beginning, that he was just curious if his ex finally had kids, got married ect. 3) She also neglected to mention that he had been reaching out to many people from his highschool past, both male and female. 4) She also neglected to mention that the other ex he contacted was out of prison for attempting to murder her husband (he really wanted to know the story behind it) 5) She also neglected to mention that although her post is nice and friendly, she refused to speak to him though this whole ordeal. 6) She also neglected to mention that her husband has never been unfaithful other than looking at some porn, were-as op herself contacted through some backwoods social media a MUCH younger guy to hook up with. Granted, it was 6 years ago, but her husband never did anything close to that. 7) She neglected to mention that she has major depressive disorder and generalized anxiety disorder and commonly takes little things and blows the hell up for days or weeks until she needs medical intervention, yet her husband us still fucking there and never once actually made moves to cheat or divorce! 8) She neglected to mention that he dis NOT leave her at the theater, he left to cool down from all the sneering and cold shoulder he was getting from OP. He was there in the parkinglot before the movie ended. 9) She neglected to mention that he tried talking with her but she refused to speak to him AT ALL. The entire time sneaking away to write and laugh with you guys in her fantasy world were she's always right. She basically refused to communicate what-so-ever. 10) She neglected to mention that her husband also promised to never contact another ex ever again and that he had no issue with that at all since it hurt her.

To me, and maybe I'm biased, it sounds like her husband was fully willing to communicate and go to any length to make amends, even though there was no ill intent on his part, but instead, OP actively made a choice to break communication entirely with her husband.