Why wouldn't a guy strike up a friendly conversation?

Anonymous
I recently joined an online class. There's a guy who said he has hobbies similar to me during intros. I'd reached out to him once through text to ask a doubt in work. And apart from that we've talked just once in group. Why won't he reach out just for a friendly conversation about our hobbies?
Updates:
20 d
PS: There's another girl in class who is his friend and I also talk to her a lot. This girl and me were talking about painting (common hobby with the guy) and she said "we can sometime plan a group painting with him since he loves painting too"
PPS: Recently as in joined the class a month ago.
Why wouldn't a guy strike up a friendly conversation?
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