PARIS: Hey, I’m the director and I’ll decide who’s born to be what, and Brad is Romeo.
LOUISE: Hell hath no fury like a woman scorned.
A popular misquote from William Congreve’s 1697 play, The Mourning Bride, previously discussed. The quote is often wrongly attributed to Shakespeare, and as they are currently studying Shakespeare, I think this is meant to imply that Louise is one of those people who use the quote without understanding its origin or context. It’s the second time she has used it against Paris.
Louise is correct that Paris is barring Tristan from being Romeo out of pique that he didn’t want to date her more than once. Paris does eventually give in and give the part of Romeo to Tristan, although she clearly doesn’t have much faith that he will stick with the project until the end (her lack of confidence in him turns out to be well-founded).