BobbiJo you can definitely tell him to stop contacting you. I did, and it was great. I actually only heard from stbx last night after almost five months. I got a ton of healing done during that time.
However, how will that affect your arrangement with the kids? If you have something set in stone, I would tell him you don't want to hear from him unless someone is bleeding, dying, or dead (theoretically speaking), that you are not switching days, and you just need a break.
Im still standin better than I ever did looking like a true survivor feeling like a little kid Im still standin after all this time and Im picking up the pieces of my life without you on my mind..