He seems like he's just being friendly to me, speaking as someone who is often friendly in a similar way.
Some people find it pretty easy to be expressive like that, but ironically were they to try to actually flirt, or think about the meaning behind how they're acting (like if they had feelings beyond the norm) they'd probably shut down and over-examine their every impulse to avoid potential awkwardness/giving themselves away. What I'm getting at is that for some people, being easy and expressive actually means that they're just being natural, or actually don't care that much.
I'm like that basically, when I don't care people think I'm flirting (but really that's just my default nice), and when I do care people think I don't like them because I'm actually inclined to avoid them, because my natural ease in social situations abandons me and the awkwardness of the situation feels like death.
But I don't know him, so I can't say for sure, but I think generally if people are flirting they give something away. Even if they're too embarrassed to be direct, then maybe something about how they treat you will be a little awkward, goofy, or reserved, there should be some tell that gives it away from standard cordiality.