Oblivious, Please be careful. There's a very good chance that OM is lying to you as well, at least somewhat. People do whatever's in their own self-interest, especially when under duress.
Give him 1/10th of what he gives you.*
LISTEN, don't talk.
Take his evidence, thank him for it, and tell him you'll be back in touch.
Treat him like the enemy of your enemy, nothing more. A temporary ally, but one of which you need to be most wary.
GOOD JOB on nutting up and confronting/exposing. I would have preferred you not get into it directly with OM, but -- using the guidance above -- you may as well see what he has to say, and what he can provide you with.
Puppy
*If he asks you for something private, confidential, legal or financial -- something where your own internal "alarm bells" are going off -- you should tell him "I'm sorry. While I appreciate you giving me this information, make no mistake -- I do NOT trust you, and you still played a role in the damage to my marriage. I'm not going to share that kind of information with you just yet."
