So he could very much be intetested?
If he tries hard to sound natural & is interested in what you think, then yes, he could.
What do u mean by natural?
Relaxed, Sincere, Open
Even if u like the girl?
Yes, even if we like someone.
This is like asking why some people are quieter than others.
Si I shouldn’t give up on my crush and keep talking to him first since he’s responsive to me?
So I shouldn’t*
I wouldn't give up, no.
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Why do u suspect he’s shy and not just uninterested?
Because of the information you previously shared, you said he carries the conversation I'd you initiate.A person who is not interested will not engage in conversation, most guys will be polite and look for a way to end the conversation.
How will they end the conversation by one word replies :D?
Why do u suspect that he’s shy?
Because we have spoken before and I know how he acts