The guy sounds like a fruit loop and if you start going tto police and filing reports who knows how miserable he will make your DPs life.
Its an offence but not the crime of the century.
Think about the time, effort, the stress your going to go through.
Im just saying that if it where me I would just get a PO box and move on its just not worth the energy. You really want your DP to get into a fight over it with him.
Usually in these cases it ends up being one thing after another and before you know it is a big mess. Seriously save yourself the trouble.