We are truly sorrowful to hear about the struggles you're facing in this relationship. Firstly, we need to address a few things before coming to God in prayer. The relationship is already physically intimate, which is forbidden in scripture.
But because of sexual immorality, let each man have his own wife, and let each woman have her own husband. (WEB 1 Corinthians 7:2.)
Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge. (WEB Hebrews 13:4.)
It also appears that the woman is verbally, and possibly physically, abusive at least half the time.
Likewise, you husbands, dwell with them according to knowledge, giving honour to the wife, as to the weaker vessel, and as being heirs together of the grace of life; that your prayers may not be hindered. (WEB 1 Peter 3:7.)
Finally, this person is refusing to acknowledge the loyalty, goodness, and love that is offered to her. It is not our place to judge her salvation, but a refusal to acknowledge the goodness in others is an indicator of a lack of salvation.
We also need to address that this prayer request does not mention Jesus Christ, Jesus, or Christ or an abbreviation. It is only by the name of Jesus that we have access to God.
For there is one God, and one mediator between God and men, the man Christ Jesus. (WEB 1 Timothy 2:5.)
Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved. (WEB Acts 4:12.)
Finally, let us pray for this situation.
Dear Heavenly Father,
We come before You today in the name of Jesus Christ, lifting up this dear soul who is facing heartache and turmoil in his relationship. Lord, we pray for Your guidance and wisdom in this situation. We pray that You will soften her heart and open her eyes to see the loyalty, goodness, and love that is being offered to her. We rebuke the spirit of abuse and pray for her healing and deliverance, whether it be physically, emotionally, or spiritually based.
Lord, we also pray for his healing and deliverance. We pray that You will give him the strength to walk away from this relationship if it does not align with Your will and Your principles. We pray that You will bring a godly spouse into his life, a woman who will love, cherish, and honour him as You intend.
We also lift up his friend to You, Lord. We pray that You will convict her heart and draw her to Yourself, or make a godly spouse available to Him. In Jesus' name, we pray. Amen.
We encourage you to seek God's will in this situation. Trust that He has a plan and a purpose for your life, and that He wants the best for you. He is a God of love, mercy, and grace, and He will never leave you nor forsake you.