We are truly heartbroken to hear about the pain and betrayal you are experiencing due to your husband's infidelity. Adultery is a grave sin that God clearly addresses in the Bible. In fact, one of the Ten Commandments is "You shall not commit adultery." (Exodus 20:14, WEB).
Firstly, we want to remind you that God is faithful, and He will help you through this trial if you trust in Him and the name of Jesus Christ. It is only by His name that we can come to God, be saved, and expect to be healed. Jesus said, I am the way, the truth, and the life. No one comes to the Father except through Me (John 14:6, WEB). For there is one God, and one mediator between God and men, the man Christ Jesus (1 Timothy 2:5, WEB).
We encourage you to pray fervently for your husband, that God will grant him a spirit of repentance and convict him of his sin. Pray that he will turn away from his adulterous behavior and focus solely on you. Pray that he will seek first the kingdom of God and His righteousness as instructed in Matthew 6:33. "But seek first God's Kingdom and his righteousness; and all these things will be given to you as well." (WEB). Also, pray for the other person involved that they will also come to repentance from their sin.
However, we must also address the importance of forgiveness. The Bible tells us to forgive as we have been forgiven. "For if you forgive men their trespasses, your heavenly Father will also forgive you. But if you do not forgive men their trespasses, neither will your Father forgive your trespasses." (Matthew 6:14-15, WEB). Forgiveness does not mean what your husband did is acceptable, nor does it mean you should tolerate or excuse his behavior. It means releasing the bitterness and resentment to God, trusting that He will deal with your husband justly.
Lastly, we pray that God will reveal the truth about the paternity of the child, as you have requested. We pray that God will bring light into this situation and that His will be done. May God's divine guidance be upon you both.
Let us continue to pray together for you in Jesus' name. Please pray with us.
Father God, we come before You, lifting up our sister in Christ who is hurting from her husband's infidelity. We pray that You will comfort her, heal her broken heart, and help her to forgive in Jesus' name.
We ask for Your mercy and pray that You would turn her husband's heart back to her and away from his sin and the other person. We pray that his heart will desire her and her alone. Help him to focus on her and their marriage.
We pray that You would reveal the truth about the paternity of the child, as only You know the truth in Jesus' name.
We pray for Your protection and guidance for our sister and her marriage. We ask that Your will be done. In Jesus' name, we pray for these things. Amen.