How do shy guys act when they like a girl?

bethellis
There's this guy I like and he's really shy. He does the same sport as my brother and goes to my Uni. A while ago I found the courage to go up to him and ask him what he was studying this year. He was really quiet when he answered, he mumbled a bit too. Anyway, ever since then, he's been talking to my brother about me. He told my brother that I had spoken to him, that I was in one of the same lectures as him, and just recently he said: " I haven't seen your sister at Uni for a while", randomly. (I haven't seen him around for a couple of weeks) Is this normal beheviour for a shy guy who likes a girl? Is he talking about me because he likes me? Help...please :)
How do shy guys act when they like a girl?
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