"It Ends With Us" is a novel by Colleen Hoover, not a movie. The book, however, deals with mature themes such as domestic abuse, mental health, and trauma.
While the book itself is not explicitly 18+, it is important to note that the content may be unsuitable for younger audiences.
The film adaptation of "It Ends With Us" is currently in production and is expected to be released in 2024. The film's rating will be determined by the Motion Picture Association (MPAA) once it is completed.
Until then, it is impossible to say definitively whether the film will be rated 18+ or not.
