Good idea on the law, twice burnt. I think society used to look at things that way. Perhaps in certain cultures it still does. But we are in the instant gratification society. Some states recognize alienation of affection suits, but far too few. And all the electronics have led to an explosion of this. My H had a fling overseas while working there for a few months. In decades past, he would have come home and had difficulty with continuing any contact, let alone incessant communication. Now, the AP can be in your house 24/7. And we all know about the FB, "high school reconnection" issues. My H tried that too before he found a way to run.
In it, I can't quote properly on the IPad, but you've nailed it for me. Things that were years in the past, and had been followed by many loving interactions with H, were suddenly front and center as his reasons to do what H believed he wanted to do. Because, as you say, his huge, narcissistic? ego never forgave me. He'd play the same card over and over again.
The sadistic efforts to assert power and control amaze me. He's got his adult kids not talking to me. Now he brings them up in every conversation - oh, I was on Skype with this one, emailed that one. Looking for a reaction from me.