What's the deal with this guy?

I am often attending Lindy Hop social dance sessions and throughout some years I have met a guy who is hard to read. We can be standing there, looking at each other for 5-7 seconds. Then he looks away, then he looks back at me again and we look at each other for another 5-7 seconds. It goes like that. We dance and talk and we both take initiatives. But I am mostly the one getting him to talk. I have to ask things and tell things, to get him to talk. When I have done so, he talks without problems. But I have to start him.

But still, he doesn't seem that eager to take the initative to talk. We talk about things but he often walks away after a while. Tells he needs to take a drink or change shirt or whatever. And then he doesn't come back to continue talking. But I can see him standing there, talking to other people without any issues and with a relaxed body language. When we are talking, he seems stiff and unnatural. Yet, he doesn't seem to want to be talking to me much. And still, when he is on the other side of the dance floor, he keeps looking at me.

I simply dont understand what he wants. Why is he so stiff around me? Why can't he talk naturally with me? And if he wouldn't be interested - why does he keep looking at me, making eye contact with me constantly?

What's the deal with this guy?
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