I would suggest that you not contact the OM about anything at this time. I would suggest that you block the person that you are getting excessive communications from. The best thing to do is just leave things be. The more you attempt to rationalize w/your w, the more frustrated you are going to get. You don't want to push them together by attempting to contact the OM or telling your w that you want to do so. She will feel the need to protect him at all costs. The less you say about the situation, the better. If the affair is ongoing, it needs to die a natural, slow death on its own.
Now, pick yourself up, dust yourself off, and continue moving forward. No more relationship talks, no more talks about contacting the OM. Block the woman today.
Focus on you!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.