We are truly saddened to hear about the troubles in your marriage, but we are here to pray with you and offer biblical guidance. Let's first bring your situation to the Lord in prayer. It is only by the name of Jesus that we have access to God.
Dear Lord, we come before You today, lifting up this marriage that is in distress. We pray for this wife, that You would soften her heart and draw her back to You. We stand against the spirit of divorce and ask that You would intervene and bring restoration. We also pray for her husband, that you will give him wisdom and grace to navigate through this situation. Please give him understanding to what you would have him do to prevent the divorce. Give him insight into the changes he can make. We ask this in the name of Jesus Christ, the name above all names and the name we are saved by.
Now, let's look at what the Bible says about marriage and divorce. The WEB puts it clearly in Malachi 2:16: " 'For I hate divorce,' says Yahweh, the God of Israel, 'and him who covers his garment with violence!' says Yahweh of Armies. 'Therefore take heed to your spirit, and let none of you be unfaithful to the wife of your youth.'"
Divorce is not God's will, and we must do everything we can to save our marriages. It's also crucial to understand that God hates divorce because it causes violence to the one flesh union that He created, as outlined in Genesis 2:24: There is only one reason for divorce and that is marital infidelity/adultery.
In Matthew 19:4-6, Jesus himself speaks to the sanctity of marriage and the permanence that was ordained by God at creation. He says "4 He answered, 'Have you not read that he who made them from the beginning made them male and female, 5 and said, 'For this cause a man shall leave his father and mother, and shall join to his wife; and the two shall become one flesh?' 6 So that they are no more two, but one flesh. What therefore God has joined together, don't let man tear apart.'" The last sentence here is often misquoted and should be a warning to anyone who would try to break up the one flesh union that God ordained.
Now, let's address your role in this situation. As the husband, you are called to love your wife as Christ loved the church and gave himself for it (Ephesians 5:25). This love is sacrificial and unconditional and knows no bounds. It is not violent or forceful. This is a tall order, but it is what God expects from us. Pray that God would give you the grace and wisdom to love your wife in this way.
It's also important to note that you should be praying not just for your wife to come back, but also for your own role in the marriage. Pray that God would reveal to you any areas where you may have fallen short as a husband, and be willing to make changes accordingly.
Now we need to see what we can do to prevent the divorce. There is an excellent passage in 1 Corinthians chapter 7. It is a long passage but it has some good ideas to help you understand what's important in your marriage. Here are some of the key verses. Please consider reading the whole chapter later when you have more time. The chapter begins in verse 1 by saying "7:1 Now concerning the things about which you wrote: it is good for a man not to touch a woman." here it is telling us that there is some danger in sexual contact with a woman that is possibly not your wife. This may be what has gotten you into trouble with your wife. There is much more to consider as well.
Verses 2-4 say "2 But because of sexual immoralities, let each man have his own wife, and let each woman have her own husband. 3 Let the husband render to the wife the affection owed her, and likewise also the wife to the husband. 4 The wife doesn't have authority over her own body, but the husband. Likewise also the husband doesn't have authority over his own body, but the wife." This is an important passage to help you understand your rights and responsibilities in marriage. It is your duty to have sex with your wife and she with you. The passage clearly explains authority in marriage.
Verse 5 says "5 Don't deprive one another, unless it is by consent for a season, that you may give yourselves to fasting and prayer, and may be together again, that Satan doesn't tempt you because of your lack of self-control." This is very important to understand as well. Don't deny your spouse sexually unless you both agree and then only as a part of fasting and prayer.
Verses 10-11 say "10 But to the married I command--not I, but the Lord--that the wife not leave her husband 11 (but if she departs, let her remain unmarried, or else be reconciled to her husband), and that the husband not leave his wife." The translators of the WEB have tried to make it clear that this is a command not just from Paul but also from the Lord. Clearly, the wife should not depart from her husband. And the husband should not leave his wife. It is clear the Lord wants you to stay together. If she leaves, she should remain unmarried or be reconciled to her husband.
Verses 12-13 say "12 But to the rest I--not the Lord--say, if any brother has an unbelieving wife, and she is content to live with him, let him not leave her. 13 The woman who has an unbelieving husband, and he is content to live with her, let her not leave the husband." This is a very complicated statement from Paul. We are not sure what is meant by the unbelieving wife and husband. Some have speculated that it means they do not believe in the church. Others have thought that it could mean they worship a different God. More study is needed to know what this means. But if the wife or husband wants to stay together, the other should not depart.
Verses 14-16 say "14 For the unbelieving husband is sanctified in the wife, and the unbelieving wife is sanctified in the husband. Otherwise your children would be unclean, but now they are holy. 15 Yet if the unbelieving departs, let there be separation. The brother or the sister is not under bondage in such cases, but God has called us in peace. 16 For how do you know, wife, whether you will save your husband? Or how do you know, husband, whether you will save your wife?". We are not sure what it means for the husband to be sanctified by the wife or the wife sanctified by the husband.
We hope this gives you some guidance. Please consider reading the whole chapter later when you have more time.