How to know if someone file a police report on you?

I reached out to this guy after 5 years of not speaking to him basically explaining the reason I wasn’t talking to him and that I didn’t mean to bother him or anything it’s just something I wanted to clear up because I want to move on, he saw it but didn’t respond. Four months after he send me a message saying how he filed a complaint with the police for harassing him and the cops are going to visit me soon with the papers. I didn’t know what to say so I blocked him and i couldn’t catch myself I was panicking and stressed out thinking of my whole life. I don’t want anything to do with him but I don’t understand why he would do something like that and why file the report and tell me? Why scare me? What kind of game is he playing? Is he lying so I would beg him not to get me in trouble? I can’t figure this guy out when I wasn’t speaking to him he was like a dog in the rain. Please help.
How to know if someone file a police report on you?
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