What does it really mean when a guy puts his hand on your shoulder?

singer1345
lately I've been so confused since a friend I am in love with puts his hand on my shoulder for no reason& I don't know what that means when he did that. does it means he's attracted to me, is he flirting with me , is he making a move on me, I don't know I am so lost I need HELP!
What does it really mean when a guy puts his hand on your shoulder?
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