Guys, Why do guys put their hands in their pockets when a girl is flirting with them?

Anonymous
I have a thing for this older guy at my work. Today while we were riding on the elevator together I started being a little flirty. As soon as I got flirty he put his hands in his pockets. He was standing up tall (not acting like he was nervous), smiling, responding to what I was saying and didn't tell me to stop. But Why did he put his hands in his pockets like that? Did I make him uncomfortable, or is it a good sign?
Guys, Why do guys put their hands in their pockets when a girl is flirting with them?
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