What it means
Australia has had a no-fault divorce system since the Family Law Act 1975 (Cth). The only ground for divorce is the irretrievable breakdown of the marriage, shown by the couple being separated for at least 12 months and there being no reasonable likelihood of reconciliation. The court does not consider who was "at fault" for the breakdown, and reasons such as adultery or conflict are irrelevant to whether a divorce is granted. Conduct may occasionally be relevant in separate parenting or property matters, but not to the divorce itself.
How it's used
She was relieved to learn Australia has no-fault divorce, so she did not need to prove her husband's behaviour to end the marriage.