my ex best friend's psycho ex boyfriend called me an hour or 2 ago, but doesn't realize it. Dude is…

my ex best friend's psycho ex boyfriend called me an hour or 2 ago, but doesn't realize it. Dude is insane. threatened me a month ago, did some messed up things to my ex bestie, including put his hands on her and keyed her mom's car (caused a shit ton of damage). I cut her off 2 weeks ago when I put 2 and 2 together and found out she was dating my abusive ex fiancee (like wtf, why would you break up with one nut job and go out with a guy just like him?!)....now I'm concerned. there is no reason my number should be in this psycho's phone and because he threatened me, I do fear for my safety. cops around here won't be much help because I didn't report the initial threat and because I was never in a relationship with him, I can't file a PFA....like I'm not kidding when I say this guy is fucking nuts....