Guy rubbed the top of my back during a hug. Is that flirting?

The previous time we had seen each other, I dropped my biggest hint so far that I like him. There are some professional boundaries around us so I think we're both testing the waters. Him rubbing my back sent electricity through my body so I'm wondering if the chemistry is mutual. Could it be his sign of flirting?

Guy rubbed the top of my back during a hug. Is that flirting?
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