If a guy touches the ear of a girl, what does it imply?

It was a videoke night with friends. I was closely sitting with my guy friend, there were times that he put his left arm on my shoulder that is totally fine but sometimes it gets extended to my ear. He's a new friend and that's our 2nd time to hang out. I don't have a clue if he even likes me...
If a guy touches the ear of a girl, what does it imply?
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