I haven't read the entire thread, but in some states, if you introduce someone as your spouse (and you are both unmarried, male and female) - then you may be considered as legally married. It's enough to stop alimony payments from a previous spouse who is released only upon the remarriage of his ex. This constitutes legal "remarriage" - just introducing someone as one's spouse.
I have also been pondering for some time the legal aspect of
marriage under Hebrew law seen here.
Briefly:
Acquiring a Spouse
Mishnah Kiddushin 1:1 specifies that a woman is acquired (i.e., to be a wife) in three ways: through money, a contract, and sexual intercourse. Ordinarily, all three of these conditions are satisfied, although only one is necessary to effect a binding marriage.
The process of marriage occurs in two distinct stages: kiddushin (commonly translated as betrothal) and nisuin (full-fledged marriage). Kiddushin occurs when the woman accepts the money, contract or sexual relations offered by the prospective husband.
Kiddushin is far more binding than an engagement as we understand the term in modern English; in fact, Rambam speaks of a period of engagement before the kiddushin. Once kiddushin is complete, the woman is legally the wife of the man. The relationship created by kiddushin can only be dissolved by death or divorce.
Which would be saying, briefly, that once there was an agreement, a gift of betrothal (usually wedding ring), or sexual relations - each of these requires the consent of the woman, btw, so forcible betrothal cannot happen in this way - then the couple are essentially betrothed such that a divorce would be necessary to break the betrothal.
So I would think that it might be possible that any couple that planned to be married, the wife received a ring, they had sex, and live together - there is nothing anymore that makes them
not married. (So they might as well get married? They avoid no spiritual "entanglement" by refusing to legalize the union.)
Just a thought. NOT a comment on any particular situation (I have not read the thread), and
NOT a suggestion that folks can just live together and say "it's ok, we're really married" ... that's between you and God, and
NOT my place to say it's ok!
Just some stuff to think about.