Premanand Maharaj Ji
When is it right to leave my spouse, and when should I not?
Adultery is the ground for ending a marriage
If a husband or wife is adulterous, the relationship should be ended, however beautiful, wealthy or well-behaved that spouse appears. Otherwise life and dharma (right conduct) fall into crisis.
If the husband is adulterous with other women, or if the wife is adulterous, then she or he should be given up. Then the relationship should be ended.