Key legal question
Whether the respondent owed the appellant post-separation maintenance based on concubinage or an implied agreement.
Extracted holding
Swiss law did not establish a maintenance obligation after separation; the facts showed no express or implied agreement to support the appellant beyond cohabitation.
Extracted reasoning
A simple partnership aims at a common purpose, which ended with the relationship; the respondent’s conduct showed no objective intent to provide support after separation, and any promise of donation or rente would require written form.