Dave,
I feel really bad for your son. Have you mentioned to your W how this is affecting him and maybe she should try and talk to him?
I know this has got to be tougher on the kids then it is on us. They just don't understand. And a mothers love is supposed to be unconditional.
Take care of those kids Dave and take care of yourself.
I don't think you should unconditionally let her back in but she is confused and could use your help.
Maybe if you let her back in......then you could work on the issues.
I've told my W why I thought our joint counseling was pointless. Because she has got to actually to decide to or want to be married and be a part of my life first, then in C we can work through our issues.
Hang in there Dave....remember why were here.

Matt