My friend and I had hung out together. We both sat down across from each other and he started touching his face with his hand. At first he started tugging on the collar of his shirt for a few seconds, then he started rubbing his mouth area and the sides of his face with his hand throughout the start of our conversation.

Soon after, he started copying my actions. I was touching my lips with the palm of my hand while resting my elbow on the table and soon after he had done the same while I was doing it. Or if I cracked my knuckles, he'd crack his knuckles.

He and I had a really good talk with each other. Before I left, he stuck out his hand for a handshake and I shook it. He's never done that to me before and it's not like I was leaving him forever, just for a month. We plan on seeing each other more after I get back. We've given each other hugs before in the past. Why did he do that?