How did she meet this OM?
As for confronting her to make her feel bad, well that could backfire, because she might not even feel bad. She could turn it right around on you for even reading her emails.
The power you have right now is information that she is lying to you again and is planning on meeting some OM this weekend at a hotel.
The hardest thing for you now is your decision on trying to stay married or be done with it.
If stay married, than it is time your wife admits she has a problem and gets it fixed. Just saying, gee I am sorry and I have a problem is not admitting it, it is just telling you what you want to hear.
This has to be the end of the game playing.
You also need to be prepared tonight for her lies and her denials and her Oscar winning performance with the How dare you look at my emails.
Be prepared for the lies. She will probably say something like it was only a game, I was going to pay him back, get him there and then say forget it.
None of that matters and keep that in mind throughout all of this. Tell her what matters is she is talking to other guys again, making plans, talking about sex and actually meeting them.
ALL of those things = affair.
It doesnt matter if it was a game or not...totally irrelevant.
Stand your ground and do not let her sway you. If she wants to stay together, you should now tonight.
With the usual stuff like she gives you all her passwords. The OM full name and address and where he works. You read all of her emails in front of her. She shows them to you.
You have been through the false R before, you have heard it all before. Stand your ground and just be no nonsense and calm with her. Which is going to be the hardest part.
Depending on what happens, you might even consider telling her friends husband what his wife is really planning this weekend.