I read your thread, and the responses to it. Our Lord have mercy on all the errors in this thread. God Bless you for repenting of your sin. Ignore quickly anyone telling you that this is no sin. The Apostles explicitly warn that this is indeed a grave sin. You are hitting the nail on the head in much of what you wrote in your post, and in your emotion. It is clear that the Holy Spirit is leading you toward holiness, how else could you know sin as sin? Now, there are some fundamental errors with your theology that if fixed could truly help you. First of all you are not outright saved. Just look at your predicament. You were saved at your first and only Baptism provided it was a Trinitarian Baptism, you are being saved through your reception of the Sacraments - chiefly those of Holy Eucharist and Reconciliation, and finally you will be saved when you die, provided of course that your Faith - and your Christian works from your Faith - endure to the end.
You had asked if you can confess your sins to each other. This question I believe in your heart you know the answer to... How can two offenders confess their crime to one another and expect that justice will be brought to them in this life?
This of course would be a huge rift between Catholicism or Orthodoxy and Protestantism. We Catholics or even the Orthodox would believe and confess that all sins ought to be confessed to the Apostolic Priesthood. We believe in Apostolic succession. Essentially that every Bishop, Priest, or Deacon is traceable - through the laying on of the hands - to the the Apostles themselves. It is this conferral of the laying on of the hands that the ministers of the Catholic Church and "particular Churches" (that have Apostolic succession) have the right to forgive sins, consecrate the host and cup into the Body and Blood of our Lord, confer the Sacrament of marriage, etc. So to answer your question - as a Catholic - you are to confess your sins including fornication and all other sins that you have committed in your life to your local Catholic priest who is hearing confessions. Your first confession would be called a "general Confession", it is for you to hold nothing back as you are confessing to God before the Apostolic priesthood.
21 Again Jesus said, “Peace be with you! As the Father has sent me, I am sending you.
22 And with that he breathed on them and said, “Receive the Holy Spirit.
23 If you forgive anyone’s sins, their sins are forgiven; if you do not forgive them, they are not forgiven.” - St.John (20:21-23)
After this confession I would advise that you "go and sin no more". Just as our Lord told the blessed woman at the well who had been fornicating with the man she lived with. I would step away from your "ministry" if you are in a position of being a "teacher" there. Also encourage you to deeply look into if what you are teaching is in fact the Apostolic Faith to begin with. This may very well be a great and marvelous blessing for you. If this woman is somebody that you truly want to spend the rest of your life with and she does also wish to spend her life with you then for sure you two should marry. And if you love each other so much then certainly a couple months of celibacy is nothing compared to a lifetime of an undefiled bed. How long have you two been "courting". And please be honest, your honesty might help others also.