It’s in dancing moments like this that the protagonists of Netflix’s wildly successful Regency­ romance adaptation fall in love and find their way to happiness. The man who crafted the steps and guided the actors through them is Jack Murphy, a London-based choreographer and movement director who has worked on all three seasons of “Bridgerton”—including the highly anticipated Season 3, which premieres in two parts on May 16 and June 13—as well as the “Queen Charlotte: A Bridgerton Story” spinoff.