What does it mean if a guy takes a sip of your drink randomly?

Anonymous
me and this guy have an undeniable connection. We constantly look in each other's eyes and smile. We have so much chemistry. But we are only friends because he is married. I would never do anything about it like act on it, but I want to know if he is attracted to me. Just out of curiosity. I set my Mt. dew down on the table and right away he grabbed it and took a sip. Then I took one right after. But did that mean anything? He usually cares about his personal space and germs but he never does with me. We always sit very close to each other on the couch (I'm best friends with his daughter and close with his wife so I stay over a lot, even though the daughter moved out. I come over to hangout with him and his wife but his wife never is really around). I am 17 but really mature physically and mentally. We would never act out on our attraction for each other. But I'm wondering if taking a sip from my drink meant anything? He is a very observant person and likes to test me on things. Could that have been him seeing what I'd do or if I would care?
What does it mean if a guy takes a sip of your drink randomly?
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