JUST CURIOUS WHY ARE THEY NERVOUS?

During a talking stage, if everything goes well why is the boy nervous to ask the other person (girl) if they wanna be his girlfriend? What makes them scared or is it just rejection? Especially if the other person is so pretty, cuz to me when he asked he seemed so nervous
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+1 y
And after four dates is it too early (even if everything goes well and get along great and have so many similarities to ask to be their girlfriend?
JUST CURIOUS WHY ARE THEY NERVOUS?
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