Hello fml, I'm sorry to read that you are still dealing with the lawsuit from your former MIL. I hope that will be finished soon, and if need be, put a boot up your attorney's backside daily in order to get some action on it. (I wouldn't normally make such a statement, but you are paying her to work!)
As for your ex....can he communicate through e-mail only? Can you, for a short period of time, have someone else read those e-mails and relay to you only the pertinent bits? At least until the lawsuit is completed and you are clear of his mother?
Anyway, I will hope and pray that at least the lawsuit is completed very, very soon! Sending prayers!