Guy Becomes Less Responsive?

There’s a male coworker who I’m pretty cool with & we have a pretty good relationship. For about 2-3 weeks we just randomly started communicating outside of work everyday and even during work hours, just casually messaging and sending each other things via social media.

This week, he hasn’t been responding to my messages outside of work as frequently or at all, which is very unlike him because he typically responds very quickly to me, even during work hours. He still speaks to me in person, but barely outside of work like we used to everyday.

On my end, we’re platonic but I THINK there might be a little interest on his side or he is just a little bit of a flirt. Am I wrong for questioning this or could there be a reason?
Guy Becomes Less Responsive?
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