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They're aware of either his attraction to you, or yours to him. Going quiet means they were anticipating something. How he said 'hello' is very important - but I would regardless recommend reciprocating contact from your crush. If he says 'hi', why wouldn't you?
He was being loud then I walked past and he softly said hello very slowly and practically whispered it but I could hear it
Volume is a small factor. That just tells me that he was a bit nervous. Figuring out why he was nervous would include inflection, body language, and would have included the ensuing conversation.Don't worry about figuring out people's intentions after the fact. Go with your gut, and go after what you want. If it doesn't work, you'll know when it fails. If it does, cool!But you've gotta go for it.
He got nervous that's all he managed to say in the moment.
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