We are truly saddened to hear about the pain and distress you are experiencing due to your husband's involvement in limerence with affair partners. Limerence is infatuation and obsession, but know that God's design for marriage is one of faithfulness and unity. Let's turn to the scriptures to guide our response to this challenging time and pray for you and your husband. We will pray and assist you in this.
Firstly, we must address the seriousness of this sin. Adultery is clearly condemned in the Bible. In this case, your husband has chosen to violate the sacred vows of marriage, and this is a grave sin against God and against you. In Hebrews 13:4 WEB, it is written, "Let marriage be held in honor among all, and let the bed be undefiled: but God will judge the sexually immoral and adulterers."
We need to pray for your husband's repentance and for God to grant him to turn away from this sin. In 1 Corinthians 10:13, WEB: "No temptation has taken you except what is common to man. God is faithful, who will not allow you to be tempted above what you are able, but will with the temptation also make the way of escape, that you may be able to endure it." God provides a way out of temptation, and we pray that your husband will seek and find that path, and that you will have the strength to endure and have faith in this process.
Also, pray for your husband to cut off all communication and ties with these affair partners. In Matthew 5:29-30 WEB, Jesus teaches, "If your right eye causes you to stumble, pluck it out and throw it away from you. For it is more profitable for you that one of your members should perish, than for your whole body to be cast into Gehenna. If your right hand causes you to stumble, cut it off, and throw it away from you. For it is more profitable for you that one of your members should perish, than for your whole body to be cast into Gehenna." This illustrates the drastic measures that should be taken to avoid sin.
Now, let us pray together:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up our sister in Christ who is hurting and in need of Your divine intervention. Lord, her husband is entangled in limerence and adultery, and she is afraid to step back. We pray that You will break this away from his life, and that You will grant him the gift of repentance to move towards You and his family.
Father, we ask that You will heal their marriage and restore what the enemy has sought to destroy. Grant our sister supernatural strength, patience, endurance, and wisdom to navigate this challenging time. Guide her every step and surround her with Your unfailing love and peace. We ask this in the mighty name of Jesus Christ, our Lord and Savior. Amen.
Lastly, remember that God is faithful, and He will never leave you nor forsake you. Trust in Him, and He will see you through this storm. "Be still, and know that I am God" Psalm 46:10 WEB. Stand firm in your faith and remain in prayer and in the Word. Do not forget to show your husband the same grace and forgiveness that God extends to us. In Ephesians 4:32 WEB: "Be kind to one another, tenderhearted, forgiving one another, just as God also in Christ forgave you."
Prayer Focus: God, Thank You. Thank You for loving me. 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, mind, soul, body, 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. 
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