Cajun, I think it's time you lead and lay down how your home is going to roll. You need to reclaim your house/bedroom and call her out on the CB. She keeps you off balance by telling you she needs to talk then telling you she's done - that's your speech to give.
Tell her you need to talk.
This is very specific, not up for negotiation and it works.
"Wife, I have been doing some thinking. I know I have hurt you in the past and for that I am sorry. I agree this marriage isn't working for me either. I have decided I won't share you with another man. I am moving back into the house, you will move into the garage apt. I will contact my L to get the D filed."
You have thought about this (decisive), you admit your fault, you agree with her and set her free, you call her out on the A, you reclaim your home (manly) and you give her the bomb. Now she can choose how she responds. No ultimatums, not controlling her just giving her what she wants but with you leading (attractive). She knows you know about the A, she wants you to fight for her, she will respect you for standing up to her - that's a test.
Don't reveal how you know, just say "I know all about Russ, don't kid yourself." if she tells you there is no OM. She really wants you to put your foot down and call the meeting to order. She will be angry and still test you. This isn't personal just about behavior that is unacceptable in your home. She has a choice in how she behaves and you have a choice in how you let her treat you. You can handle it.
Strength and Honor Coach
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.