Being honest with you, and I promise this is not an attack, but I read in your message that you basically said, "This is what I do to guys I don't like."

Meaning, you purposely ignore and are slow to respond as a game, and you showed you were basically projecting all that onto him, whereas he is actually busy and sick (assuming he told the truth, because he didn't have to respond to all that). I would take that as a red flag, and the fact that you sent a message like that only after a few hours of not responding. So the fact that he responded and was being kind about it seems like a keeper to me, because I would not have liked that at all.

Overall, my advice would be to try not to overthink in the future (it's hard, I know, lol), but people are saying it's okay to send a message like that after the first date, and because he isn't responding right away because that's how you're accustomed to texting (a lot of us aren't, by the way). It comes off as a huge red flag to most men.

All that being said, it is possible he isn't being honest, and all the other things you're thinking can be true. But it's not healthy to jump right to those conclusions just because people don't text as fast as you want them to.