All the advice about going to HR is great, and you absolutely should.
But on a personal note, I'm really sorry you are dealing with this. Absolutely not even remotely okay for him to do this and you are well within your rights to force an end to this. Wildly unprofessional behavior and down right creepy behavior just on a personality level.
I hope you find peace from him soon.
Yeah but that's a different scenario all togther. Not all men are dangerous rapists, obviously. But enough are prone to assault and SA that it's statistically safer to have some random bear (possibly grizzly or teddy) than some random man. If you don't feel like the random guy walking down the street is dangerous, that's probably because random men on the street don't regularly harass you, which is unfortunately still a very common occurance to most women.