I knew a sister who was DF'd when she remarried after a divorce. Years later her first husband (non-witness)admitted he had cheated on her before they were divorced, thus breaking the marriage bond and freeing her to remarry. I don't know if she received an apology but no apology could erase the years she spent hanging her head in shame and being shunned as she went to the meetings attempting to be re-instated.
I do know that her second husband (also not a JW) was not impressed...