How to get this toxic and chaotic guy to move on?

This guy I met last year as a friend has been chasing me despite he knows I'm gay - I've told this guy no numerous of times , but he refuses to move on and leave me alone.. he's making me sick- I've been overwhelmed due to this guy and other stuff I'm working on.. he's hot and cold , inconsistent, full of drama , and mixed signals.. he hasn't changed and I doubt he will change with his behavior.. I've moved on from this guy, but he keeps contacting me

Advice and clarity is needed
Updates
2 mo
I have blocked 🚫 him but he keeps contacting me some kind of way multiple numbers and outlets.. had to delete my tik tok account due to this guy
How to get this toxic and chaotic guy to move on?
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