Why does my friend rub my back when he hugs me?

Why does my friend rub my back when he hugs me?

So, I have this friend who I used to be "talking" to but now we are just friends and every time he hugs me goodbye, he rubs my back. I feel like this is weird because when we were "talking" he would just hug me and not rub my back.

Why is he rubbing my back?

Why does my friend rub my back when he hugs me?
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