Vergiss Dein Ende (2011)

Hannelore (65) has been caring for her husband Klaus (69), who has dementia, for four years. She is now at the end of her tether. When her neighbour Günther (65) unexpectedly goes away on a trip, Hannelore simply follows him—leaving her husband alone at home. What Hannelore doesn't know is that Günther has just lost his partner to cancer and wants to take his own life in a vacation home on the coast.