What's the difference between how a guy acts with his close friend and his crush? My crush is very close with this girl, I've always thought they?

What's the difference between how a guy acts with his close friend and his crush?

My crush is very close with this girl, I've always thought they had a thing, but recently he has been showing interest in me. I was just wondering if it's normal the way they act with eachother and how do you know the difference between being close friends or being more than friends.
What's the difference between how a guy acts with his close friend and his crush? My crush is very close with this girl, I've always thought they?
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