Why would he only want to Facetime?

I have a guy friend whom I caught up with recently and we texted in paragraphs for a month straight. Now we transitioned to FaceTiming and he only does it at night and we don’t really converse too much. He’ll be studying or on the computer. Now he only texts me to FaceTime him. I miss texting him but when I try to make a convo through text, he keeps it short. Could this mean something? He likes me? FaceTiming or texting would be better?
Why would he only want to Facetime?
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