What does it mean when a guy kissed the top of your head?

Anonymous
I was with a guy yesterday and I had my head on his shoulder while watching a movie at the theater. He's my best friend but we both have admitted to having feelings for the other. While laying on his shoulder he kissed me on the top of my head, and that's not the first time. Why did he do it? And what does it mean?
What does it mean when a guy kissed the top of your head?
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