What do you think about this dynamic? what should I believe?

So, here's the situation: I was at an event with my boss, and he couldn't drive me there, so he asked a gentleman (the head of that reataurant where the event was held) to drive me in his car. When he called me, he said, "Hello, this is restaurant delivery," and I thought is genuine. When I got in the car, after a while he shook my hand and told me who he was. I was stunned. After some days at another, we saw each other at another event. I was at a table very close to the front, and he was at the back. At one point, I wanted to go to the bathroom and passed by his table. I didn't see him at all, but later I found a photo in which I caught him looking at me as I was leaving. After I came back from the bathroom, I stayed at the back of the room, leaning on a cocktail table, and I spotted him. I started looking at him, and in less than a second, he turned to me and looked intently into my eyes, then looked at my shoes, my waist, and back at me. I smiled at him, he mimed a "hello," smiled subtly after that body scan, and I smiled back in response to his greeting. And today I had to spoke to him again after a month, business related. As we were discussing logistics, i wanted to hang the call and he said “I’m the one from restaurant delivery” and I told him that I really believed him, and he laughed, satisfied, and then said, "Very good, this is how it should be” and he said he should have sounded more serious, so I would believe him completely, and I told him I suspected it wasn't from the restaurant delivery, but I wasn't sure, and then he said, yes, that's what you thought (but he was very sarcastic). opinions?
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6 mo
Thank you for your answer!

But why? What could be the reason? Just for fun?
What do you think about this dynamic? what should I believe?
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