He hasn't texted me back, but he's been on Instagram...?

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I've been seeing this guy for about four months now. In the beginning, we would hang out pretty much every other day, if not EVERY day. Now, we see each other maybe once every other week. I don't see him nearly as much as I'd like to, but I understand that he needs his space. Plus, I know that there comes a point in a relationship where a guy feels like he doesn't have to try as hard. Although we don't see each other that often anymore, he is always the first to text me and he will tell me throughout the week that he is thinking about me. Sometimes I feel guilty for not texting him first and making him feel like he is doing all the work, so I texted him this morning. Just a simple, "hey there" was all I said. It's been 4 hours and I haven't heard back from him. I know he has his phone on him, because he keeps posting on Instagram. Is it normal for a guy to ignore a text? I don't think I've done anything to upset him...I mean, the other day in the hall at school, I was in a big hurry to get to class and I didn't say hi to him when we passed, but I don't think he'd ignore me over something so small...Maybe my text was too vague? Perhaps I should've said something like, "Good morning! Hope you have a great day! " I don't know!