Why don't guys text back?

So there's this guy I like, and I'm pretty sure he likes me back. He works all the time, so during the week our only form of communication is texting. I don't text him that often, but I want to know why sometimes he'll respond RIGHT away and others he just won't ever respond.

I mean, if you liked a girl and she texted you, wouldn't you always respond?
Why don't guys text back?
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