Questão jurídica principal
Whether the cantonal alimony calculation was arbitrary because the wife's basic needs and housing costs should have been reduced due to alleged concubinage.
Decisão extraída
The challenge failed; the record did not establish a qualified concubinage, and even with the proposed reductions a deficit would remain, so the maintenance amount was not arbitrary.
Fundamentação extraída
A qualified concubinage requires an equivalent to marital mutual support, not merely cohabitation. The Obergericht's result remained sustainable because the wife's needs were still not covered even under the husband's proposed figures.