Havnt we already read this hayato confession chapter before??

Yes but those were just extras in the manga and it wasn't official while this one is the real deal the author is now acknowledge the importance of this character and wanting to be official, and try re-read chapter 61 there's an explanation t's the first thing you see in that chapter

Meanwhile:
We still don't know mc's name

I didn't even notice that

Ehe~

We get his name after the 3 years and Hatano confesses again and solidifies it by saying the MC’s name for the first time in the story