We are truly sorry to hear about the struggles you're facing in your marriage, and we appreciate your honesty in sharing your situation. Firstly, we commend you for recognizing your addiction and it is important to stop all sin. Pornography is sinful and offensive to God. It defiles the marriage bed and it also leads to other issues.
Turn to God and repent, which is a decision to stop and refrain from pornography and sexual sins. Pray to Him and ask for forgiveness of your sins. Remember, there is no condemnation for those who are in Christ Jesus. God will help you overcome this sin through His Holy Spirit.
But I say, walk by the Spirit, and you won’t fulfill the lust of the flesh. For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, that you may not do the things that you wish. But if you are led by the Spirit, you are not under the law. Now the deeds of the flesh are evident, which are: adultery, sexual immorality, uncleanness, lustfulness, idolatry, sorcery, hatred, strife, jealousies, outbursts of anger, rivalries, divisions, heresies, envy, murders, drunkenness, orgies, and things like these; of which I forewarn you, even as I also forewarned you, that those who practice such things will not inherit God’s Kingdom. But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faith, gentleness, and self-control. Against such things there is no law. Those who belong to Christ have crucified the flesh with its passions and lusts. If we live by the Spirit, let’s also walk by the Spirit. Galatians 5:16-25 WEB
It is also important to confess your sins one to another. Find a brother in Christ, a true Christian believer, and confess your sins to him so that you may be healed. Consider finding a Godly accountability partner that will pray with you and help you.
Confess your offenses to one another, and pray for one another, that you may be healed. The insistent prayer of a righteous person is powerfully effective. James 5:16 WEB
Flee sexual immorality, remembering sexual immorality is any sexual activity outside of marriage. Every other sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. God calls us to be holy and to flee sexual immorality.
Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. Or don’t you know that your body is a temple of the Holy Spirit which is in you, which you have from God? You are not your own, for you were bought with a price. Therefore glorify God in your body and in your spirit, which are God’s. 1 Corinthians 6:18-20 WEB
Let's also pray for your marriage as we know God loves marriage and hates divorce. He will help you restore your marriage. Be prepared to love your wife as Christ loved the church and gave himself for it. This may cause suffering and going above and beyond what you think you can do. Commit to be a servant leader to your wife. Be prepared to be the spiritual leader that God has called you to be.
Marriage is to be held in honor among all, and the marriage bed be undefiled; but God will judge the sexually immoral and adulterers. Hebrews 13:4 WEB
Let's pray together:
Dear Heavenly Father,
We come before You, lifting up this man and his marriage. Lord, he has acknowledged his sin and we ask for Your forgiveness and mercy. Help him by the power of the Holy Spirit to overcome this addiction and to walk in purity and holiness. Give him the strength to flee sexual immorality and to honor his marriage bed.
Father God, Jesus said except for sexual immorality, divorce is not an option. Help this couple to reconcile and restore their marriage. Help them both to love each other as You have loved us. Let the fruit of the Spirit be evident in their marriage. Lord, remove the fighting and strife and fill their marriage with love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control.
Help this man to be the husband and spiritual leader that You have called him to be. Help him to love his wife as Christ loved the church and gave himself for it. Let their marriage be a testimony of Your love and faithfulness. We ask all these things in Jesus Christ's name. Amen.
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. 
