Boyfriend Has Been Getting Threatening Calls For A Few Years Now, We Finally Know Who The Guy Is. What Can We Do?

For the past few years, my boyfriend has been getting REALLY aggressive calls and voicemails from a random man who knows his name and keeps saying things like “fck you, you know where i am, come fcking find me and let’s fight”
My boyfriend has tried responding once to no avail because the man just got more aggressive. This whole time, he’s been calling through No Caller ID. Today, he finally called without dialing *67 and I was able to reverse search his number to find more information about him. I also reverse searched my boyfriend’s number to see if anything aligned, and I found out the previous owner of his number is friends with the aggressive man on facebook. I don’t know if my boyfriend just got wound up in some random personal beef but honestly we’re both kind of scared.
I know for a fact there is no way my boyfriend knows who the hell this man is, we’re both random college students and this man is in his mid 50’s to 60’s.
What can we do? I’ve told my boyfriend to scrub his personal information off reverse search websites, and I’ve considered recommending calling the police about this.
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