What types of decisions regarding fault are in Poland?
There are 3 possible divorce court decisions regarding fault. The court in the divorce decree may decide that:
one of the spouses is fully at fault for the breakdown of the marriage,
both spouses are at fault,
no-fault divorce (without a decision on fault).
Polish lawyer who specializes in divorce and family law may help you estimate if there are grounds and enough evidence to request and get divorce with the other spouse fault indication.