Search Results: uncomfortable around boyfriend

So this older guy (about early 40s, I'm 23) started at my work. He is well dressed, groomed and looks quite confident and smart. I was very friendly toward him but he kept a deliberate distance by being cool, not rude. So I gave up.
He's a quiet type, bit withdrawn but can be very outgoing at times, people generally like him and ask his advice as he seems very intelligent and some things he says sound really wise.

He had to sit beside me for a few days. First he said nothing. Next afternoon he just asked me how I was and that was it- never stopped. We both like Sci Fi , books and David Lynch. He knows lots, like he said the puzzle in Good Will Hunting wasn't that hard and even gave me advice for an application I was doing, offering to look over it as he's been a manager before.
Then for a few months we didn't see each other. I moved on with my boyfriend and he knows this.
Anyway, I catch him looking at me across the office often though he looks away if he thinks I see him. Not in a creepy, undressy way but a warm smiley way. He never just hangs around me or makes me uncomfortable, never says anything odd or sexy when he makes conversation in the kitchen though he does act a bit nervous.

Recently in the canteen he was sitting across from me and didn't see me as he was being quite loud with this blonde girl he'd trained with, laughing and different from how he is with me. He was quite open with a guy he'd trained with too.

Few days later he started up a conversation in the kitchen and as we walked back to our desks he suddenly apologised for not saying anything to me in the canteen as he hadn't seen me till I was leaving. I laughed and said I hadn't noticed.
Later we were the last two in the office and he made conversation as I was leaving, asking if I'd be doing Christmas shopping. When I said I did it early so I could chill and watch others do it he laughed, and said I was sharp and that was one of the things that "make me like you".
So, does he fancy me?