What would be the reasons for a guy never initiating texts with a girl?

Anonymous
If a guy was your friend (just recently became friends), you talk in person at school, hang out, he looks at you when you aren't looking, initiates convos with you in person, tries to be near you... but never initiates texts with you.. what does that mean? by the way he def texts other people because he's online on whatsapp all the time and I see him on his phone always.

One more thing, we have a group chat as well, and when he does want to initiate something with me, he will address me through the group chat, not a private text... why? also when I do text him first privately, he replies and everything, he doesn't leave me on read or reply the next day.
What would be the reasons for a guy never initiating texts with a girl?
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