Is he secretly jealous?

So I know this guy and we've hung out a few time with friends, never alone. He's flirted with me a lot in my opinion and others have said so too. Things like touching my shoulder/arms, compliments, hugs, leaning/laying down on my legs, and just always sitting/standing close to me (as pointed out by others). But anyway, I was sitting next to him and texting a different guy, and I giggled at the text.. when I did this he looked over at me and asked "you alright?". But it was in a very serious tone and his face looked concerned. I was giggling, of course I'm alright lol (I wonder if he could tell I was talking to a guy? Can guys tell this by giggles?). Another thing was he asked me who my favorite spider man is, and I said Andrew. Before I had a chance to explain he mockingly goes "Why? Because he's cute?". Which is not the reason but that's for another time.
Is he secretly jealous?
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