... let it go. Which if you watch the movie will understand quite clearly and maybe even see the same way - so no pun intended. While the movie does take directions I did not expect (not all of them), it feels a bit ... well almost underwhelming. It is tough to feel really close to the characters. I do believe that your moral code will inform who you will root for more. But even then, I don't feel like you will do so with enough passion.
Funnily enough "passion" being in the German title of the movie. Also quite funny: the twist at the end, the maybe you could call it openness of the movie. Maybe you will feel you know what the ending is and what it means (for the characters) ... but likely you will feel ... weird! The ending may be too clever for its own good ... and the movies own good too ... decent and quite interesting ... but might leave you cold (no pun intended)