Wait, we're going back to the premise of the story? Someone pinch me.
just forget the times it was brought up and also brought up that they were avoiding having to talk about that, forget when it was brought up in the beauty contest arc, forget when it was brought up in the resort arc (dunno what to call that one really?) or when it was brought up in the beach filming arc.
Seriously all the comments complaining there is "no progress" every time it is not mentioned in a chapter is tiring. It's not the whole premise, it's part of it. Sunao already suspects Lemon lied, Lemon doesn't know how to tell Sunao she lied, Sunao told Suzuka first what he thought had happened and later that he suspected Lemon lied, it has been a constant thing avoiding letting other people know they used to date because it would be awkward or hard to explain and they would have to confront it.
THE PLOT NEVER FORGOT ABOUT IT, EVEN IF THE CHEATING PART WASN'T SAID EXPLICITLY, FOR FUCKS SAKE CAN WE STOP WITH THESE COMMENTS EVERY CHAPTER?