Now I'm a little pissed. I am waiting for W to get home so I can go to group at church, S asks where I am going, told him daddy has a meeting to to work on feeling better. S says "mommy says you go to meetings because you drink too much beer" I can't ffing believe this. She is planting this seed in my S head. I really went to let her have it, I am pissed beyond belief. I am going to leave as soon as she gets home and try and calm down. But it will be very hard to not say anything about what S has said.
Any suggestions?
Yeah I have a suggestion, tell her plain and simple that she is not to speak to your son about things she doesn't have accurate information on. Would she like it if you started telling your son about the affair she previously had and give him the details of what's involved in that? Obviously not, that's not responsible parenting.
Tell her that a mature attitude during your in-house separation is a requirement on both parts. If she has so much anger and resentment to you concerning your troubled marriage, it's possible she may want to pursue counseling of her own to deal with that anger effectively, discussing mature adult topics with young children is a boundary violation and you will document it if she continues to do it.
You are allowed to stand up to her when the need arises. In fact, I would say it's a requirement.
This isn't an argument where she is giving you trouble over something you've done in the past. She is acting foolishly and involving children in sensitive adult issues and that isn't a mature or responsible thing to do.