ok so why is no one talking about the fact that betty clearly set up the whole thing with grundy getting kicked out? her mother was a gun that she loaded (with the badly-hidden gun and her pink diary) and then cocked and pointed towards that fake ass grundy. at the end of the episode, she writes down some stuff about doing crazy shit for love in a grey diary. AND betty knows her mother is the type to read her diary, so it would have been stupid of her to keep her Actual Diary in such an obvious place.
TL;DR Betty Cooper is sneakier and way more sly than everyone gives her credit for. And also Fake Grundy and her goddamn lolita sunnies can fuck off outta here.