This guy likes me, BUT takes forever to text back, & then some...

This guy says he likes me a lot, we hang out, kissed, etc. He takes so long to respond to my texts though, and he usually IS the first person to start texting during the day. He gets a little antsy if I take a while to respond, which is why I don't understand why he thinks he can take up to an hour to wait to text me. If I don't respond within about 45 min-hour I get other texts saying "you busy?"..."you there?"..."text me whenever you can.". But I've only done that to him once or twice when he takes that long, so I know he knows that I don't really like it when he takes a long time to respond. Can anyone think of any reason as to why he does this?
This guy likes me, BUT takes forever to text back, & then some...
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