Rebecca Lockwood is a therapist and teacher of psychology. She says watching movies can provide an escape from the real world, which is comforting for some people. Especially if you are really into a movie, you can get fully immersed into that world. When you have problems in our own life, or worries that are troubling you, a comforting, familiar movie can help tune those out.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/why-do-we-find-it-comforting-to-rewatch-our-favourite-movies