The Room

Johnny is a successful banker who lives in a San Francisco townhouse with Lisa, his future wife. Lisa, having become dissatisfied with her life and Johnny, seduces his best friend Mark and the two begin an affair. As the wedding approaches and Johnny's influence at his bank slips, Lisa alternates between glorifying and vilifying Johnny to her family and friends, making false accusations of domestic abuse and defending Johnny against criticisms. Meanwhile, Johnny, having overheard Lisa confess her infidelity to her mother, attaches a tape recorder to their phone in an attempt to identify her lover. Read more on Wikipedia.