Do guys sometimes play it cool and deliberately look serious and not smile when you join them at a gathering?

I'm becoming attracted to a guy in a social group we're apart of. In the last few group meetings, he shared personal details about himself that I let on that I admired about him, and he smiled at my reactions. But then I couldn't make it to the next few meetings. So when I did arrive to this last one (and we were both there first before everyone else), he seemed less smiley than he had been previously, and seemed a bit guarded for the first while. But then during the group meeting, he started showing signs of encouragement once again for me to talk to him. So was he just initially discouraged by the fact that I vanished after that other meeting, but then got over it, or maybe it's still too soon to know if he would be interested in me in return?

Do guys sometimes play it cool and deliberately look serious and not smile when you join them at a gathering?
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