"While watching a movie or series, do you ever notice how much leg work the supporting characters put in to ensure that the main characters' storylines are not dull? This group often includes the protagonist's friends, family, neighbors, classmates — really, the list could go on forever. These people often root for the star of the show to succeed, but sometimes, their support and cheerful demeanor can shift when they feel that they have been wronged in some way. This feeling then results in the friends-to-enemies trope we often see across genres. Friends becoming strangers is something more people can sympathize with, but an event occurring between two people that turns them into actual enemies is more dramatic and entertaining for audiences. In these instances, there is usually a mixture of emotions as no one wants to see the destruction of a great friendship, but things are not always repairable.
Here are the 10 best movies where friends become enemies, ranked." - movieweb.com