What does it mean when a guy pretends to stretch his arms and then puts one around you?

So, there is this boy in my class. We have been talking for about 2 months now. I like him, put I'm not sue if he likes me. One day in class, when he was sitting next to me, he pretend to stretch his arm and then puts one around me. I looked at him and smiled, he laugh and said "I'm just kidding". It's the second time he does this. I also want to say that almost every time I see him in school, he gives me a hug.

So, what does it means?

Thank you! :-)
What does it mean when a guy pretends to stretch his arms and then puts one around you?
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