I just don't want to deal with the madness anymore.
1) so if you're at home with your son and W is out doing whatever but going back to an apartment, will you feel differently? You're a parent, so there will be time you're watching him alone. You're only a babysitter if you feel like one.
2) I totally agree on the second part. It sounds like you're rushing to end the pain, the hurt, the sadness, etc. her moving out won't solve that. Only you can.