Hi Buttercup, welcome to our community.
I hope some parents in your situation will drop by and offer what works for them. I can only speak from my observations over the years.
First off, it is an incredible huge step to be where you are in recognizing the problem and drawing a line in the cement to protect both yourselves and other family members.
Yes, they do return, and the one thing that sticks out to me is to do some serious continuing work on boundaries so when he does return you are solid as a rock. Always remember that there is no bigger victim in the world than a Psychopath while they are the ones doing the victimizing. It is going to be had when/if he returns with some horrific story so being prepared is very important
I would make sure the schools if you have other children there, the community, your neighbors and everyone you knows gets the memo that he is NOT welcome anywhere in your vicinity. Pray he leaves the area, does he now live close to you?
Does he have contact with any relatives or people close to you?
Di