Unfaithfully Yours

Movie (1984)
French title : Faut pas en faire un drame

Starring:
Dudley Moore (Claude Eastman)
Nastassja Kinski (Daniella Eastman)
Armand Assante (Maxmillian Stein)
Albert Brooks (Norman Robbins)
Cassie Yates (Carla Robbins)
Richard Libertini (Giuseppe)

A composer suspects his wife of cheating. He plots to kill her and frame it on her lover.