Girls, why did she put my hand on her thigh?

We go out a lot and there is for sure a spark and a lot of flirting but she has a boyfriend and she brings him up a few times. Her favourite song came on the radio so I jokingly tried to change it and as I was about to she grabbed my hand and put it on the inside of her upper thigh. Am I reading too much into this or is this something?
Girls, why did she put my hand on her thigh?
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