Why would a guy not be as quick with his replies after seeming keen first time around?

So I matched with a guy 2 years ago on an app. After talking for a few days it just got too much as he wanted very quick replies. We stopped speaking.

it was on my mind & I then added in him on Instagram he accepted & requested back I just thought best to not get back in contact & left it.

fast forward I have the app downloaded & haven’t really been on it. I see that he liked me on there 6months ago! I accept and he messages 5 mins later.

we have spoken on phone & meeting soon he says we have busy schedules but he wants to put the effort in & I said I do too. We’re both really attracted to each other.

He replies properly but isn’t very quick with his replies like last time

Why would a guy not be as quick with his replies after seeming keen first time around?
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