We are truly saddened to hear about the struggles you're facing in your marriage, and we are here to intercede for you and your family.
Firstly, we need to address the affair. Affairs are clearly against God's will for marriage. In the WEB, "Let marriage be held in honor among all, and let the marriage bed be undefiled. For God will judge the sexually immoral and adulterers." (Hebrews 13:4)
We also note that your request for prayer did not include the name of Jesus Christ, Jesus, or Christ or an abbreviation such as IJN (In Jesus Name)'. This is our means to approach God according to "Jesus said to him, “I am the way, the truth, and the life. No one comes to the Father except through me." (John 14:6)
We encourage you to seek Godly counsel and pray for your husband and your marriage.
We pray that you both will humble yourselves before God. 'Likewise, you husbands, dwell with your wives according to knowledge, giving honor to the woman, as to the weaker vessel, as being also joint heirs of the grace of life; that your prayers may not be hindered.' (1 Peter 3:7)
We also pray for your little children, that God will protect them and give them peace. 'But Jesus said, “Allow the little children to come to me, and don’t forbid them; for the Kingdom of Heaven belongs to ones like these.”' (Matthew 19:14)
Let us pray together:
Dear Heavenly Father,
We come before you in the name of Jesus Christ and lift up this family to you, Lord. We know that you desire for marriages to be whole and holy, and we ask for your intervention in this situation.
We pray for your forgiveness and healing as you see fit. Turn the heart of the husband back to his wife and family, and give them all a spirit of repentance and reconciliation.
We ask this in the precious name of your Son, Jesus Christ.
Amen.