My ex-boyfriend texted me after one month of NC, I replied, then he didn't reply. What's the deal?

So we broke up a month ago. He texted asking how I was. I replied saying "I'm doing great, how are you?" but then he never replied. What's the angle? Why text me, and then don't reply back? I'm considering the possibility that he didn't receive my text, but in that case what do I do? I don't want to double-text, because honestly I'm not desperate, but I don't want him to think I'm ignoring him, because that makes me look bad and childish.

If he DID get it though, why didn't he reply to me? I just don't get it.
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Edit: He also apologized in his text. So I thought he was mature enough to actually establish contact again. I think no contact is stupid, unless the person really hurt you. He didn't. He broke up with me, but whatever, it happens. I thought I knew him, and I thought he was a nice guy and mature, but I guess not. I guess people are all the same.
My ex-boyfriend texted me after one month of NC, I replied, then he didn't reply. What's the deal?
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