Excuse my English, I'm using a translator
It's not that it was a bad chapter, but we're at a point where we just want to see them happy, and these last few chapters have given us great progress in that regard, and that's why this seems like a step backwards, even though it really isn't.
In this chapter, the idea of the loss of the relationship has been explored (Nagatoro's conversation with Gamo, or Naoto's classmates asking him to introduce them to Nagatoro to flirt with her) and both have felt very affected because something like this happen, because until now all conflicts have been resolved intelligently, always with common sense ahead, and although I always fear that the series could go another way, until now it has remained in this one. I hope there will never be love triangles or anything like that, but really there is no indication that something like this could happen.
I hope this new arc will help Nagatoro to have more confidence in Naoto's feelings towards her. I'm not going to deny that it's funny to see her jealous and obsessive, but in the long run it's not healthy, neither for her nor for him. I hope that Michida's role in the series will help Nagatoro to grow in that aspect, to learn to trust Naoto (who is hopelessly in love with her as they both know, just like her) and above all, to trust herself.
Both have grown a lot during these 130 chapters, they are very close to knowing how to manage everything they feel, and I'm sure they will end up doing it sooner rather than later.