Why does he brush his upper arm against mine? Is it weird?

guitarfreak8810
Whenever I see this guy, he'll talk to me and then right as I start to walk away, he will rub his upper arm into mine while we pass. It's not like he's being a brute about it like hitting me with his arm, he just sort of lightly brushes it with mine... It's confusing.

Why would you brush up against someone like that? Is that being flirty, friendly, or what?

:/ Thanks in advance.
Yes, it's really weird...
No, it's perfectly normal!!
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Why does he brush his upper arm against mine? Is it weird?
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