It used to be, that a guilty mate, after a divorce, had to have the wronged party agree to a re-marriage, if the love birds got married anyway, violating wt policies, would find them put quickly on the outside.
There was a very handsome jw male, not even daring to date, (a precursor to marriage in wt think) , because the jealous and clearly hurt, now divorced 'sister' never forgave him, used the clause to cause his pining away.