What I've learned recently is that there can be Girl's [/Boy's] Love without a Romance tag. Just because they love each other (which I believe certainly applies to this manga), doesn't mean that there'll be any significant action on those feelings.
So if you want the plot to focus on those developing feelings, make sure you can see both GL and Romance in the tags.
As for this series, I'll take the developments of this chapter to be a low-key confession between the two, and they are now dating in all but name.