How to know if a guy is shy or not just concerned related to you?

So straight to the point, i ignored him straight, he did reach out and even called by asking how am I and why I haven’t been replying to his ‘two texts’ in total which say ‘Hii’ it’s like i just talked in cold tone and it has been 2-3 days but he hasn’t reach out like he doesn’t know how to carry a conversation, so i am just asking is it because he is giving me some space or he’s just not concerned.
How to know if a guy is shy or not just concerned related to you?
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