Unfortunately not in my experience – the more boundaries I put up the more persistent he becomes. I’ve blocked him on everything, deleted mutual friends etc but still tries to find a way to get to me.
All I can say is keep your wits about you and as hard as it is to set the record straight don’t say anything about your ex or what your doing in your life (if you still have mutual friends) to people. The less that gets back to him the better.