What does it mean if a girl opens her mouth slightly when checking me out?

[Anonymous]

I was at the outdoor swimming pool with school
A girl was standing beside the ladder as I got out and although I wasn't looking at her, I could see that she was looking down at my chest through her sunglasses.
Her mouth was slightly open, is that a side effect of checking someone out or is it more?

[jstar11]

it means you should over analyzing trivial behaviour and thinking any girl that looks in your direction wants your d

[Asker]

except I'm not. This girl looks at me all the time. My gut says she likes me. She is sometimes nervous around me. I don't really talk or look at her tbh but as I just said, she seems to have a bit of a crush on me.

[jstar11]

just go ask her out then, you'll never know if you just speculate

[Anonymous]

It means nothing at all