Anyone who reads this should at least be acquainted with Aesop's "The Fox and the Grapes" that this is representing.
This really sucks for the girl we follow, but it's the real consequence of her previous rejection. I could see a follow up being the girlfriend realizing she doesn't actually have a place in Minami's heart because it's still locked up around our MC, but even without one, this is the harsh reality of calling the grapes sour. Strangely, I like it.