What is he thinking when he stares at my legs?

Anonymous
So there is this guy I secretly like, we work together. So I started noticing that he stares at my legs quite a bit (especially upper thighs and crotch). When I look at him, he immediately stops looking (he's shy). I think he thinks that I don't notice his staring. Sometimes I have tight spandex/jeans on and sometimes I wear loose pants and he still stares. My immediate reaction was ooh he likes my legs but then I start feeling uncomfortable and start thinking that I sat on something or somethings wrong with my legs (because he is always staring). He stares if I'm standing, sitting, my legs are crossed or not. What is he thinking? I'm not used to this because most guys stare at my face, butt, boobs but not legs! Plus when were talking he fidgets with his hands a lot and is always smiling.

We are both sort of nerds. When we first met we sort of friend-zoned each other right away, so most of our other co-workers think we are just best-friends. He's mentioned several times to me how he wants to get married soon (om general, not specifically to me), and I've told him that he needs to wait until he finishes college and gets a good job. Also both of us have never dated and we're both virgins. We are both 20 years old.
What is he thinking when he stares at my legs?
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