The Elementary Particles
(2006)

After being dumped by his student, Bruno finds love with Christiane who agrees to come with him to sex parties.

In one of these, she gets hurt and has to sit in a wheelchair. Bruno proposes but she refuses, fearing pity. She later gets drunk and jump of her balcony. Bruno falls again, this time for ever.

Meanwile, his newly awarded brother Michael finally gets Annabelle pregnant and they get to visit Bruno in his asylum.   

Thanks Mirko!