Have you not read the clear magisterial documents from John Paul II and the Congregation for the Doctrine of the Faith? If you have, you have the teaching.
There in Familaris Consortio were described several cases:
80 Trial Marriages (CCC 2391 Some today claim a “right to a trial marriage” where there is an intention of getting married later.)
…people today would like to justify by attributing a certain value to them. But human reason leads one to see that they are unacceptable…
81 De Facto Free Unions (CCC 2390 In a so-called free union, a man and a woman refuse to give juridical and public form to a liaison involving sexual intimacy.)
- Those almost forced into a free union by difficult economic, cultural or religious situations, on the grounds that, if they contracted a regular marriage, they would be exposed to some form of harm, would lose economic advantages, would be discriminated against, etc.
- In other cases, however, one encounters people who scorn, rebel against or reject society, the institution of the family and the social and political order, or who are solely seeking pleasure.
- Then there are those who are driven to such situations by extreme ignorance or poverty, sometimes by a conditioning due to situations of real injustice, or by a certain psychological immaturity that makes them uncertain or afraid to enter into a stable and definitive union.
- In some countries, traditional customs presume that the true and proper marriage will take place only after a period of cohabitation and the birth of the first child.
…above all there must be a campaign of prevention
82 Catholics in Civil Marriages
Catholics who for ideological or practical reasons, prefer to contract a merely civil marriage, and who reject or at least defer religious marriage. … not even this situation is acceptable to the Church.
84 Divorced Persons Who Have Remarried
- those who have sincerely tried to save their first marriage and have been unjustly abandoned.
- those who through their own grave fault have destroyed a canonically valid marriage.
- those who have entered into a second union for the sake of the children’s upbringing, and who are sometimes subjectively certain in conscience that their previous and irreparably destroyed marriage had never been valid.
…
With firm confidence she believes that those who have rejected the Lord’s command and are still living in this state will be able to obtain from God the grace of conversion and salvation, provided that they have persevered in prayer, penance and charity.
Joseph Cardinal Ratzinger
During the meeting with clergy in the Diocese of Aosta, which took place 25 July 2005, Pope Benedict XVI spoke of this difficult question: “ those who were married in the Church for the sake of tradition but were not truly believers, and who later find themselves in a new and invalid marriage and subsequently convert, discover faith and feel excluded from the Sacrament, are in a particularly painful situation. This really is a cause of great suffering and when I was Prefect of the Congregation for the Doctrine of the Faith, I invited various Bishops’ Conferences and experts to study this problem: a sacrament celebrated without faith. Whether, in fact, a moment of invalidity could be discovered here because the Sacrament was found to be lacking a fundamental dimension, I do not dare to say. I personally thought so, but from the discussions we had I realized that it is a highly complex problem and ought to be studied further. But given these people’s painful plight, it must be studied further.”
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_19980101_ratzinger-comm-divorced_en.html