I think a guy with a girlfriend is trying to hit on me. What should I do?

Anonymous

A guy I work with is supposed to have a girlfriend, but his behavior towards me has been rapidly changing here lately. Key points -

*He never mentions the girlfriend around me anymore

*He has changed his work schedule to match mine. I've always done early/AM shift because I'd prefer getting off sooner. He always chose evening because he didn't want to get up early. Now, he is on AM shift like me.

*He is making really hard attempts to work directly with me. We never really used to work directly with each other that much. Now, he's wanting to work as close to wherever I am as possible.

*He has started literally cornering me in the breakroom when we go to a break period. He will pop up when I'm in there and immediately say hi/call me by name. He won't usually acknowledge anyone else in there at the time. When we are leaving for the day, he makes sure to stop me to say bye/have a good night and usually throws in another comment like he'll see me tomorrow.

*Whenever he's around me, he stares. A lot. If we are working by each other, all he freaking does is stare me down. Like he just can't seem to keep his eyes off me. I constantly catch him looking my way.

*He teases me and jokes with me all the time.

*He randomly grabbed my hand and held it one time when we were on a project together.

So am I overthinking/crazy here... or is this guy truly attracted to me/trying to make moves despite supposedly still having a girlfriend? What should I do about this? I don't want to pursue something with someone who is taken. I'm not like that. But I haven't really had to deal with a taken man wanting me before either, so I don't know what I should do or if I'm even right about this.

I think a guy with a girlfriend is trying to hit on me. What should I do?
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