Guy sends WhatsApp message after midnight?

So this guy I'm really good friends with sent me a message at around 1am. It was an image with a joke. And the next morning he texted asking if I liked what he sent my last night. I know late night texts are bootycalls but does this fit the category? This guy and I are close and we often flirt and whatnot but he's in a long term relationship so nothing happened. What should I make of it?
Guy sends WhatsApp message after midnight?
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