How do girls behave towards men they start to like, how do they behave around them, how do they feel?

There is a girl I think likes me. but I am not sure. When she passes me, her head is bent forward, she smiles slightly and her face turns red. it's been like that for a long time. For a short time these behaviors were discontinued. then it started again. Didn't find any bits for me. I don't want to misunderstand. I can't open up to it. I have a fear of rejection.
How do girls behave towards men they start to like, how do they behave around them, how do they feel?
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