Questão jurídica principal
Whether the wife's alleged concubinage required taking evidence and justified ending the maintenance duty
Decisão extraída
The allegation was insufficiently substantiated; refusing evidence did not violate federal law, and the maintenance obligation was not terminated on this ground.
Fundamentação extraída
A right to evidence under Art. 8 ZGB presupposes timely and properly pleaded facts. The husband had only vague allegations and limited indicia, insufficient to establish a stable, marriage-like union.