It could still be the first option... 🤷🏼‍♀️

Let me tell you something about men. We are pigs far more often than we are homicidal maniacs. Ask him why he always stares at you. It is not appropriate and you should call him out on it.

Well yeah, sure, I mean, when guys get girlfriends their biology and eyes just shut right off, right?

You really don't know how men work. There are lot more players than killers. The odds are heavy that it's the first option. Also, serial killers don't like office work.

Maybe he just doesnt like you. It is possible, despite it not being so often, for someone to stare at someone else just because they dont like them. As for the "he's having sex with you mentqlly while he stares"... ehh, not sure if staring is required for that. Having said that, i think you meed to confront him peacefully and sort things out, and if that doesnt work, THEN you can go to HR.

Because never in the history of humans has a man cheated before (sarcasm). It could definitely still be that first option. I’d put my money on that before “oh he wants to kill me”.

could very well be wanting sex.

I guess it’s good we apply a stereotype to someone and know we are correct.

Never know, maybe he wants to have a three way with you

Maybe he's bored with how things are at the moment, and wants a threesome? And, maybe he would be positively surprised if you ask him about that the next time he passes you😉