I am trying to find a German language film (which is in all likelihood also a German production) about a woman with relationship problems.

An early scene shows the main female character swimming in a pool (public, not private) with her husband. She is completely naked and filmed from underwater, and they are alone in the pool.

Her relationship with her husband deteriorates and they start spending time apart. She courts a young man of East Asian background throughout the rest of the film.

In the one scene I remember most vividly, she is seen riding through a car tunnel on her bicycle. At the end of the tunnel she hits and rips off the left mirror of a stationary car(standing in the middle of the road), which happened to be her husband’s car with him inside it. I suspect she may have done that deliberately as her husband had been waiting for her on that same spot before, in an earlier scene where she identically rides the bicycle through the tunnel.

In another scene the East Asian man visits her at home, where she tries to entice him while taking a bath, until they are interrupted by her mother who brings her a phone call from her husband.

She and her husband never get back together. The film ends with her and the East Asian man traveling on a subway/urban train late at night where she sits on his lap and kisses him while he is disinterested, after which they are seen walking to his apartment where she was anticipating to have sex with him but this never happened, he rejected her advances and behaved awkwardly toward the end. The next morning she wakes up in his apartment totally depressed for having lost her husband and having failed to make the other man her new boyfriend.

The German actress playing the main female character somewhat resembles Martina Gedeck and has jet black hair. She looked to be in her early 30s and was absolutely stunning. Her husband is of similar age, and blond & blue-eyed.

The film must have been produced in the 2000s, although early 2010s and late 1990s might also be possible. I watched it three years ago (on the internet) so it cannot be newer than 2012. It is set in a large or mid-sized German city, and many scenes take place at night showing empty streets.

The film is about relationships but the atmosphere of the film is very much gloomy, cold and not melodramatic at all. All the characters talk very little, and there is almost no music in the film. It is definitely a so-called ‘arthouse’ or alternative film and not aimed at mass markets at all, which is why my searches for it have been unfruitful.