He texts me first, but always gives really short replies!

He's really talkative in person and sometimes in texts. But he usually will only respond with things like "I see" or "Alright" after I respond to his texts. It's confusing because he always texts me first, but never seems like he wants to talk. We're not dating, but we're really good friends.
He texts me first, but always gives really short replies!
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