I am planning on leaving my wife. I have a long post on r/relationshipadvice explaining why. I am nervous because it will shake up our relatively pleasant lives. I have screenshots of text messages and FB messenger messages proving she cheated on me. She does not know this. How do I use this to my advantage? Also when and where is a good time for me to tell her? In the past we have always been home at night when we had emotional conversations, then we would have to be together in the same house, with her crying, its always awkward. We have a marriage counseling appointment in two weeks, should I tell her during the appointment to have a third party present? Can I wait that long? Any advice would be appreciated, I can give more details if needed. Thanks!

edit I have another messy caveat. She works as a financial advisor, so guess where all of my money is! I am going to have to ask her as her client to withdraw my IRA etc. I know she could get in trouble with her firm if she tries anything funny, so I am not TOO worried about it. I was thinking of talking to a higher up at the company before I take action.