Ignore the calls. Get a call blocker. Do not pick up on calls you do not recognize. Remove your phone number from Facebook. Go to the police if there has been any threats against you. Don't talk to this guy any more. He's obviously some sort of scammer that picks on women.
I don't understand why you haven't blocked him on Facebook. Do that and you'll never see or hear from him again, nor will he be able to see anything on your page. So easy to do, it sounds like something isn't right with your posts.