Guy's Behavior

Guy drinks out of your cup what does this mean?

Me and this guy i really like (who i believe also likes me) were at lunch. He said that he was thirsty and he wanted to know if he could waterfall some of my pepsi. I said oh no you dont have to waterfall it you know. And he drank right off of it and smiled. Does this mean anything a long the lines of he was nervous, or he likes me or anything of the sort. he's a really awkward kid so. its kind of hard to tell if little things mean big things. Or what means what to who, because even my friends dont drink off of me. If they do they are pretty reluctant
Guy drinks out of your cup what does this mean?
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