"That's where I am. I love her and I want to keep this marriage going but in her current state she's not good for me. I'm setting some boundaries and letting her have her life. If she comes back, fine. If not, that's fine, too. I'm making the changes I need to make in my life to be a better man and a better father and I'm looking out for myself and my son. What she does or does not do is up to her."
I was of the impression you were already "here". So nothing has changed.. you just needed to vent?
"She is now resisting any further counseling and she has "lawyered up" so that's the direction this seems to be headed. As painful as it is, I'm OK with it. I'll get a lawyer to look over the paperwork and as long as I'm protected and my relationship with my son is protected I'll sign it."
Let me be clear.. stop pestering her about C. You imply that you are. I knew that she had written papers and had talked to a L. If you are at the point that the tension is making you act/sound "crazy" stop.. go dark. If you can smile and talk civil to her on the phone then continue on. If you need to go dark then set a time that you can call and talk to son.. make it a consistent thing to call at that time. I am really close to telling you to stop whatever you are doing right now and L up.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.