He is active on social media but not responding to texts?

I have been talking to this guy for a while and we talk every day. I have noticed he has been a little distant but I understand as he actually has been busy with work and school. He texted me good morning this morning and asked how I am doing, I responded but he hasn’t texted me back and it’s been over an hour. I went on Instagram and noticed he posted a story 2 minutes ago. Should I just leave it be? Should I be worried?
He is active on social media but not responding to texts?
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