Fair Game 1988 on netflix

When Gene, a maniacally deranged computer-game designer, gets dumped by his beautiful artist wife, he devises a masochistic plan for revenge. Taking his spouse prisoner, Gene locks her in her windowless Los Angeles loft but leaves her with something to keep her company — a deadly mamba snake. Via electronic sensors and cameras, he watches with glee as his terrorized ex-lover fights for her life.