Are we talking talking if he carries on texting the next day?

Some guy I was friends with at school texted me to see how I was doing. We haven’t talked in yeaaaars.

Anyways he was a really nice guy and we had a really fun conversation.

It’s been 2 days since and he’s texted me the next morning and carried on the convo.

He’s also apologised for late replies and tells me if he’s going to be busy for a couple of hours.

Does this mean he’s interested in me and we’re texting as more than friends? My issue is he's such a nice guy but I see him as a friend.
Are we talking talking if he carries on texting the next day?
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