What does it mean when a guy puts his arm around you?

megan15
OK so I was walking with about 6 friends today and all of the sudden a guy I know puts his arm around me. Then later on he did it again and after that he put his hands on my shoulders. I've known him ever since I was in 3rd grade and he's a nice guy and all and he's cute. Does this mean he likes me?...Anything helps thanks! :)
What does it mean when a guy puts his arm around you?
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