It is what it is; prying into the details of that would only cause pain for me
This. Do you really want to know what happened between them? I have tons of sex-act pictures of the ex and the OM that the OM's wife sent me. Tons. Do you really want to know the details of hers?
You have proof. You don't need anymore. And if you truly aren't a troll, then I don't think you could handle knowing that she did things to him and vice-versa...
Some boxes are best kept closed.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.