I was with my friend for a walk yesterday and he kept scratching his crotch and looking at my like glancing at my boob, what does this mean?

I was with my friend to catch up after we hadn't seen each other since high school due to him moving away.

I went on a walk with him this afternoon and he kept looking at me and glancing at my boobs and scratching his crotch, I saw him do this a couple times, what does this mean?

Updates
8 mo
(I got called a troll for this question so maybe I should rephrase)
I was with my friend to catch up after we hadn't seen each other since high school due to him moving away.

I went on a walk with him this afternoon and he kept looking at me and glancing at my boobs and scratching his crotch, I saw him do this a couple times, why do men do this?
I was with my friend for a walk yesterday and he kept scratching his crotch and looking at my like glancing at my boob, what does this mean?
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