So girls, what does it mean when a guy hugs you and you scratch and rub his back during the hug?

Anonymous
When I hug this girl I have a crush on, she always rubs and scratches my back. The hug is usally at least 8 seconds, and I hold her tight, and she rubs and scratches my back up and down. Why do you think she does this? Is it because she likes me back and is flirting, or is it something else? What is the reasons behide a hug like this?
So girls, what does it mean when a guy hugs you and you scratch and rub his back during the hug?
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