What does it mean when he replies late but act as he is interested?

Guys I need your opinions on this, I’m talking to this guy since nearly three months, at the beginning he was replying fast, like does not take more than 4 hours, but lately he started to reply late, he would take even one day, but when he does he replies for every text and ask questions as he is interested.. I don’t wanna ask because we are not in a relationship yet. But it makes me confused and I don’t know what to do honestly, I reply to him in a decent amount of time, not later than 4 or 5 hours and one day I was really upset from his late replies and did not reply for a day, he double texted me and asked where I’ve been

What does it mean when he replies late but act as he is interested?
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