Name of a European '70s movie about a disguised robber on a motorcyle (whose identity isn't revealed till the end)?

The suspected or alleged bank robber is assumed to be a blonde man who has an intimate relationship with a brunette woman, but it's later revealed that the robber was the woman he was sleeping with, who is killed or dies in the last robbery that she makes. The robber in the movie always gets away on a motorcycle. The film is definitely European even though I'm not sure if it was dubbed in English or if it was a British movie.

Does anyone know the name of the movie?

NOTE: It is not "The Great Riviera Bank Robbery", AKA "Sewers of Gold" with Ian McShane).