He texted me after a month of no contact?

We dated for a few months and then he pulled away and we never formerly broke up and haven't speak to each other for more than one month. Today he texted me out of the blue he simply said Hey and it took me a few hours to answer back because I didn't know what to say but didn't want to be rude so I texted back Hi. It's been five hours and no response at all. Is he playing games or what? I see him online but no text back.
He texted me after a month of no contact?
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