LH,

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So how can I try and stop this A from going any further than it already has?


You can't.

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I am going to confront my W about A and the OM, but what do I do about the OM? Do I confront him as well?


I understand your need to confront your wife and i know you plan to do it. I also think it's a mistake. Confronting him IMO is a mistake also. Too easy for things to escalate.

I'll tell what I do know, if you try to interfer with this affair, you will drive them closer together with you as the enemy.

Think teenagers. I'm sure you've at least known a teenager or two who were forbidden to see a boy/girlfriend. I've known several as a teen and as an adult. I'll just say, they were instantly more in love than you can imagine. Do you really want to facilitate that? Just askin'.