Sorry, this one is a male who rarely read Grapara, so he didn't know Airi Katsura (sensei) habits. The one is a female.Noted, and I very much agree, just up in my feelings atm.
The cope is laid on extra thicc here. Surely the MCs do meet again at least once within the final two chapters, really hoping it's the next one with the extra wait time for it. Is this the same friend that was a big Kodansha fan. Not corrrecting the misunderstanding seems a bit weird, but we still need to see what becomes of fucboiXSakura. If KA stops promoting GraPara! over the next 2 weeks then we'll know for sure, the writing in his chapter did feel a bit different compared to the rest.
Now, she was confused as to how Sakura who appeared to be single in chapter 133 turned to be the fucboy's girlfriend all along. She also suspected about the ghost author, implying that the author for chapter 133 and chapter 134 were likely different people. The ghost author was assigned to end Grapara.
IMHO, if the suspicion is true, Keishi Nishikida sensei, the illustrator, is likely to be that ghostwriter.