Why does he reply late all of a sudden?

We are in the talking stage, and he used to reply fast, but recently he started to take longer time like may reach up to 10 hours, but at the same time when he replies, he seems interested and asks questions, says that he misses me but kept replying late and it makes me confused. I was not bothered at first and said he maybe busy, but it has been over a week, and I’ve noticed today that his snap score has raised but still leave me on delivered..

Why does he reply late all of a sudden?
Post Opinion