(Canada) Police called my phone regarding potential case. Advice needed

Long story short, I was bullied in secondary school by this one big guy. He would call me the n word regularly and has beaten me up more than once (we're talking pretty bad beatings where my parents took me to the hospital because he almost blinded me permanently). He harassed me every chance he got but that's not really the point of this post.

I sent him a message last year in good faith basically saying I know he probably feels bad for how he treated me but that I was praying for him and wished him the best. He responded with a neutral response saying he does feel bad and wishes me well too. I continued the convo asking why he did what he did and it spiralled into a massive blob of back and forth where he basically responded like a compulsive liar despite me sending him screenshots to back up my claim and he'd be like "I cant deny that photo but I don't remember" stuff.

As the convo progressed, he claims ive been spreading rumours about him (to his friends and family via fake accounts) stating that he r'd his ex and how he has my IP address pinned to those messages and how I cant deny it (also mentioned how that is defamation of character). the convo ended with him saying he's had enough of these convos with all the fake accounts and that was last year in October and I blocked.

Today, I get a call from the police saying he wants to press charges if the anonymous messages don't stop and the cop said he doesn't really want to investigate the fake profiles to see who it is but would like for me to stop if it is me. He asked if he could see the messages between the guy and I that I mentioned earlier and I sent it to him and he said he'd give it a read and hasn't gotten back. Need advice