Why is he mimicking me?

There's this guy I know and when he's sitting at a table with me and I start to shake my foot (its a habit) he'll shake his. No big deal. But today we were in the same room, sitting several rows away from each other but we could see each other still, and I had my legs crossed & was shaking my foot and he was shaking his, legs crossed. No big deal. Foot shaking is pretty common. But then I changed the movement & started doing small air circles with my foot and several seconds later, so was he. We weren't looking at each other as in making eye contact but I could see his legs/feet and he could see mine.

What's the deal with the mimicking? Does he think I'll notice our feet are in sync and fall madly in love with him or something?
Why is he mimicking me?
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