Don't know if you can get to Craig's list & have the block anything from him in your area.....but the police have no jurisdiction over the internet & they definitely have no jurisdiction over someone in a foreign country & neither does anyone within our country.

Best to think ahead about HOW you are getting involved with someone before the fact rather than after.

I am sure you can have anything deleted if he were to have anything posted if Craig's list can't block it before it gets posted....but you will have to be on the watch in that case.