Why do people hate texting back promptly? ?

Currently I'm seeing a guy. He never replies back promptly. I'm always the one replying back promptly. I have spoken to him about it and he comes up with all sorts of excuses on why he can't reply on time. Getting him to reply back on time is like pulling teeth. One day, I stopped replying on time. I would take up to 6-10 hours to reply to a text. Then he asks
"where have you been?" then starts sending texts frantically trying to get a response from me.

Why do people hate texting back promptly? ?
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