What does it mean when a guy starts randomly rubbing your thigh?

Anonymous
So I just started dating this guy and we both agreed that we would take things slow, because we really like each other. I noticed that when we're out on dates he will occasionally start rubbing my thigh, and when we're at his house alone. I'm a virgin, and I've never had a boyfriend before so this is all new to me. I'm perfectly okay with him doing so, but he gets a little nervous and pulls away every now and then. So any pointers or advice would be greatly appreciated.
What does it mean when a guy starts randomly rubbing your thigh?
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