Is it a bad sign if the guy never initiates conversations first?

I've initiated conversations with my crush on my college course when I see him quite a few times, but he never initiates conversations with me. However, when I do start talking to him, he seems keen to keep the conversation going and will continue to talk for a while and ask lots of questions.

Does this mean he isn't interested and is just trying to be polite?

Is it a bad sign if the guy never initiates conversations first?
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