The director of Suddenly is being candid about why Jake Gyllenhaal and Vanessa Kirby left the project. The movie was meant to be based on Isabelle Autissier's Soudain Seuls and would have told a story of two lovers desperately trying to survive on an isolated island. As director Thomas Bidegain is known for his French movies, Gyllenhaal's project was meant to be his first English film. Instead, reports of poor on-set behavior slowly emerged, before Kirby and Gyllenhaal both quietly left the movie, leaving Bidegain to scramble for a new cast.
https://screenrant.com/jake-gyllenhaal-set-problems-suddenly-movie-director-response/