Major spoilers for It Ends With Us and the book It Starts With Us are ahead!
In the film adaptation of It Ends With Us, Brandon Sklenar’s Atlas took Blake Lively’s Lily to the hospital, as he did in the book, after Ryle bit her.
However, Atlas never knows about it in that first book by Colleen Hoover, he finds out about it in the sequel novel, It Starts With Us.
While this leads to their first kiss, this interaction between Atlas and Lily in It Starts With Us is incredibly serious.