We understand that you are experiencing challenges in your marriage due to the influence of another woman. Let's bring your concerns to God in prayer and seek His guidance and intervention. First, before we pray, we need to have clarity about the context of your relationship.
First, we would like to clearly state that if you have not legally married yet, this may not apply to your situation. Further, if you knew this individual prior to or at the beginning of your current relationship, there may be issues. Additionally, if you possibly had sexual relations before or outside of marriage, there may be lingering spiritual issues because of that. Be prepared for the possibility of God addressing those issues that may be ongoing. Also, the only solution for the lifestyle being lived in a relationship is to make it official in a legal agreement of marriage. If you are married, then let's specifically address this issue.
We believe that marriage is a sacred union ordained by God, and any threat to it should be taken seriously. In Jesus' Name, we come before God to pray for your situation. Let's remember the comforting, but also serious, word that the Word of God brings.
I want you to marry. This will help you avoid immorality. (1 Corinthians 7:2 WEB)
But know this, that no sexually immoral, unclean person, nor covetous man, who is an idolater, has any inheritance in the Kingdom of Christ and of God. And because of these things, the wrath of God comes on the children of disobedience. (Ephesians 5:5,6 WEB)
Let's pray.
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up our sister in Christ who is facing trials in her marriage. Lord, You have established marriage to be a lifelong commitment between a man and a woman, and we ask for Your divine intervention in this situation.
Father, we pray that You will deliver her husband from any manipulation or influence of another woman. We are asking that God will remove any works of the enemy. We rebuke any spiritual, emotional, or manipulative ties that have been established contrary to Your will. We'll address further issues if God reveals them. Sever those ties, Lord, and restore their marriage according to Your divine purpose. Specifically, we are commanding any spirits associated with this other woman to cease their manipulations and be silent in Jesus' name.
We take encouragement knowing that greater is he who is in you, than he who is in the world. (1 John 4:4 WEB).
We also pray for her husband's heart, that it would be turned towards You, Lord, and towards his wife. We are speaking directly to any problem that they may be facing and command it to be overcome in Jesus's Name. Strengthen their bond and give them the wisdom and love to overcome this challenge. We pray that the Lord bring your comfort, but also reveal anything necessary.
Father, Eph 5:31 says 'For this cause a man will leave his father and mother, and will be joined to his wife. And more scripture indicates that the two will become one flesh'. We pray and speak that the two are one flesh, and run the household with wisdom and in strict accordance to the Word of God. This woman shall be silent because there will be no shaky marriage for her to prey on.
In Jesus' name we pray, Amen.
You have said that prayer should be made with up-lifted hands without wrath and doubting, (1 Timothy 2:8 WEB) choose to trust the Lord and hence do not allow discord to distract from time spent serving Jesus Christ. We encourage you to remain steadfast in prayer and faith. Trust that God is working in your situation, and continue to seek Him with all your heart.
Stand firm in the faith, be courageous, be strong. All what you do should be done in love. (1 Corinthians 16:13 WEB). If your relationship had or has inappropriate behavior or sinfulness and is not in line with Christian belief, then be ready to repent of that and turn to God for forgiveness. You can start now by confessing that sin to God and asking for forgiveness, and then confessing Jesus as the Lord of your life.
Prayer Focus: God, Thank You for loving me. Thank You for loving me, Jesus. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, soul, mind, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
