As long as safety is not an issue (it is for my sitch) then you can simply say, "I don't want you to come in right now". Or, let the phone go to voicemail. Simple, clear boundaries. Me, I have a different approach. "H, you are getting divorced. I never want to see you again".
Hey, got a minute to pray today? I need to be brave, and to be honest, I really don't wanna right now.
