Why doesn't he just leave me alone?

So something really bad happened to me.. an (old) colleague of mine did stuff with me without consent. I ended up telling this to my boss and this colleague eventually chose to work somewhere else.. but he keeps on telling people he is innocent and that I lied which I didn't and if he really was that innocent he wouldn't accept the offer to work somewhere else but anyways. I blocked him on everything and me and my roommates have this IG account with all four of us to share fun stuff and it's a private account. But he really had the audacity to send a request to follow us even though he knows I am part of this account. Why is he being so obsessed about it and why doesn't he just leave me alone? I just don't understand.
Why doesn't he just leave me alone?
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