I am looking for a subtitled movie, Takes place in Berlin. A older man married to a beautiful younger woman. He's a restaurant owner.. She the waitress. She falls in love with the piano player, Has an affair with him and her husband knows and understands. All the men come go to the restaurant fall in love with her.
One man is obsessed with her, becomes a Nazi and kills her husband from jealousy. Something like that...

Gloomy Sunday (http://en.wikipedia.org/wiki/Ein_Lied_von_Liebe_und_Tod)?