I think you are very clear in what you are doing and what you want. You are in a different boat than many here in that your children are adults. I think it was a call for you to make to tell your son or not depending on the relationship you have with him. It sounds as if you are close to each other. Do get a lawyer. Oh, and her telling you she’d take you to the cleaners…..that’s a common misconception women have. I have a male co-worker. His wife cheated on him, walk into their divorce with that attitude and walk away with nada after he had very little problem proving he wanted to reconcile AND she cheated him. Courts are also more prone toward equal time between parents, no matter what the parents want. It’s come to light, that is better for the kids. A lot has changed in terms of divorce and the once upon a time assumed outcome. I can’t believe the gaul…..she cheats on you and wants to threaten you about telling the truth about her cheating ways?