He keeps his hand on my knee, why?

I went to the cinema with a guy I'm just friends with, during the cinema he was put his hand on my knee and held it unless I had to look away from the screen to find my bottle. When I met him at a party some months later he patted my head in front of my friends and said bye, cutie after we were done talking. Does this means he is interested in me?
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Thanks for all the answers, do you think I should invite him out again and does anybody have a idea what we can do?
He keeps his hand on my knee, why?
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