New testament one who has been separated has two possibilities.
1) stay unmarried till the ex dies.
2) be reconciled to the ex husband/wife.
Keep in mind that Jesus told to the Jews that the only reason to divorce was Formication.
(that's what Deuteronomy quote was about

). And that was the debate between Jews , "if the husband can divorce his wife
for any reason".
And Jesus told them the only reason is Formication.
(Like Joseph thought to do to Marry when he learnt she was already pregnant. That's Formication for it was before they married. Otherwise Adultery was never the reason for divorce, for it was punished to death.)
Anyway , there are many things we can speak about but there is not a subject to debate about. Church, thanks to God ,knows the Truth.
I please you to see aside any personal opinion and feelings and listen the sermon with an open and humble heart. Pray to your God to give you a confirmation if what is preached is truth and let Him saw you if you have any fault please.
I am like you and I do the same as you. The only thing I strive is to know and obey the Truth. I don't care if you or anyone else proves that I am wrong in something. That's the challenge and the point of strict holy spirit teaching. We may be surprised when we realize we fail to obey something but that's what will save us at the end!