One of the grounds for divorce can be fault, which states,
§ 3301. Grounds for divorce.
(a) Fault.--The court may grant a divorce to the innocent and injured spouse whenever it is judged that the other spouse has:
(1) Committed willful and malicious desertion, and absence from the habitation of the injured and innocent spouse, without a reasonable cause, for the period of one or more years.
(2) Committed adultery.
(3) By cruel and barbarous treatment, endangered the life or health of the injured and innocent spouse.
(4) Knowingly entered into a bigamous marriage while a former marriage is still subsisting.
(5) Been sentenced to imprisonment for a term of two or more years upon conviction of having committed a crime.
(6) Offered such indignities to the innocent and injured spouse as to render that spouse's condition intolerable and life burdensome.