What does it mean when a girl touches your leg?

ashnakag666
So I was at my friends place yesterday and one of his roommates came in. She joins us in playing Super Smash Ultimate, all good and well.

While we were playing she touched my right leg, multiple times. And it wasn't on accident, she was clearly stroking it on purpose. Very subtile, but clearly on purpose. She was looking very fine so I asked my friend if she was single. Turns out she is dating someone already.

Why would a girl touch a guys leg, in a quite intimate way if she is already dating. Was she just being touchy or?
What does it mean when a girl touches your leg?
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