Adherent (2019)

Carrie Galloway is an up and coming new actress on the verge of her big break. Owen, a lonely I.T. guy who works from home all day has no friends. Until one day, a chance encounter in an elevator, Owen realizes that his favorite actress lives in his building. What happens after is a tale of obsession, misunderstandings, and real terror. Her biggest role, was his best friend.