french or german thriller

So, I’ve been trying to figure out the title of this movie for a long time, and now i don’t remember all the details. It’s a french or german film that i saw around 2003. Anyway, the main character is a psychiatrist who manipulates two  young patients, both of them are depressive and suicidal. The psychiatrist manages to create the situation where they chase each other. And one of the scenes i clearly remember is where one of these characters handcuffs the other in a bathroom. At the end, the movie has a radical twist, the characters are no longer these crazy guys, instead they appear as workers in a psychiatric hospital.

That’s all i remember, thanks for your help.

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