Search Results: keeping a guy interested

I work with this man. He seems to look at me a lot, more than other people. It always feels like he’s curious about me and what I’m up to, or wants to say something but doesn’t. Lately he has started to come up to my desk. He just says hello to me, takes some of my candy and asks me how I am. Usually our conversations don’t really go past small talk, but he has asked me about my weekend plans several times.
A few weeks ago, I was walking past him when he was having trouble getting the printer to work, and I showed him what to do. He stood so closely behind me, like within an inch of our bodies touching. Then, after I was done showing him, I walked back to our seating area and he walked alongside of me, still keeping the small distance between us.
I always see him stretching his neck and looking around my computer monitors as though he’s checking to see if I’m there.
He always seems a little bit nervous around me...

Ok, and also I have to mention. I know, because of Instagram, that he has a girlfriend. I shouldn’t know, but naturally I social media stalked him. Never once, during our conversations about our weekends, has he mentioned her. They went on a vacation together and he told me he went with this family.

So what’s his deal? Am I reading into it too much or is he interested?

I found out he's still liking her pics and keeping tabs on her, she doesn't follow him or like his stuff. Why would my boyfriend search for a picture of some random guy his ex is interested in (I doubt she has mentioned the guy to him in any way, so he must have done some research) and like a picture the guy has posted of the two of them?

so basically this guy and I had been hooking up for a month or so. we'd watch movies, go to clubs, hang out at bars, etc. he'd often stay the night, but we agreed on keeping it casual as he didn't want anything more than a hook up. one time when we went to a club, he started dancing with other girls in front of me. the next morning, he asked me if he had been an asshole or if he had done anything to upset me. I told him he had been kind of mean, and he said we should talk about it. he said he wanted to figure out what we were doing and that he didn't want to hurt me or be that guy who was oblivious. later we decided to keep it as friends as he said he didn't want anything more than a hook up and it'd be better this way. the next week at a party, he came up to me and said hi and later he asked my friends where i was because he couldn't find me. then he offered to give me my coat because I said I was cold. so I'm really confused now, can someone tell me whats going on? does he just want to be friends or is he still interested?