There are several grounds for divorce in Pennsylvania. The ground of fault is just one of them. The Pennsylvania court may grant a fault divorce to the partner, when it has been established that the other partner has deserted the spouse without any reason for a period of one year or more.
If the partner has committed adultery, it can also be grounds for a fault divorce. If it can also be established that an individual married someone else despite the existing marriage, it is also grounds for divorce.
The end of a marriage can also occur if it can be established that an individual has been cruel to the other spouse. The Pennsylvania court can also grant a divorce if it can be proved that a spouse has been sentenced to prison for a period of one year or more. Also, if a spouse can prove that living with the other spouse is intolerable, that can also serve as grounds for divorce in Pennsylvania.
If the other spouse has a serious mental illness, it is also a sufficient ground for divorce in Pennsylvania. If it can be proved that the partner has been institutionalized for a period of 1.5 years and there is no prospect that the individual will be released, that is also a justifiable ground for divorce. However, the fact that the individual has no chance of being released from the hospital will have to be certified by a person of authority.
The end of a marriage can also be brought about by mutual consent. If the court observes that there has been an irretrievable breakdown in the marriage and both parties have filed an affidavit, the court may grant a divorce as well.
Source: Pennsylvania Statutes, "Dissolution of marital status," Accessed on Aug. 25, 2015