Guy has a girlfriend but is obsessed with me?

Anonymous
We work at the same place and at the beginning he used to flirt with me a lot but I used to take it as a joke and never took it seriously and I was frankly not interested in him. Anyways recently his behavior has been getting more and more obsessive with me. He keeps blatantly staring at me a lot (also when I'm not watching) and now flirts with me in front of everyone in the office (before he used to do it privately).

I told him I don't want to talk to him anymore without giving a reason and he went mad and kept asking me why why and came close to almost kissing me in front of everyone it was I who didn't encourage it else he would have done it. He also didn't care that everyone (including our superiors) were there watching him get so close to me physically.

He's starting to get jealous of my close guy friend too whom I hang out with alone. Not just him he gets jealous if a guy even comes into close proximity with me and he makes it clear. If I don't speak to him he gets very upset and makes it clear if front of everyone that he will continue talking to me and he even makes me feel bad that I've been ignoring him harshly.

I don't know what to do. I've been clearly signaling to him I'm not ok with all this but he's not getting it. We're in the same friend circle so if things get ugly it would become very uncomfortable to come to office everyday.

On top of that, he's been coming on so strong that even I feel attracted to him now (as it is he is attractive) and we do have a lot of sexual tension.
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He doesn't behave this way with other girls by the way and some girls here are even interested in him but he ignores them completely. He keeps complimenting me all the time regarding my personality, how cute I am, how he loves my laughter, etc. and he notices every little thing about me from my habits to my quirks to how I dress etc. Every small thing I say he remembers it.
Guy has a girlfriend but is obsessed with me?
3 Opinion