The Bible says that you don't know if you will save your husband (1 Cor. 7:16). It also says to let the unbeliever leave (1 Cor. 7:15). Sometimes the more you try to save the relationship, the worse the other party reacts to it. If a person doesn't want help, you cannot help them. You cannot change him, you can only change yourself. But this is the worst-case scenario.
First thing, to pray and ask for God's guidance.
Then have a heart-to-heart talk with your husband. But you cannot get angry or tell him what is wrong with him. You must first confess your faults to him and ask him to forgive you. But you need to know the real reason he is filing for divorce. Is it because he is frustrated with you? or because he has a woman on the side? Does he profess Christ, or deny Him? If he is not a Christian, and that's the real reason for divorce, then he might be doing you a favor. If, say, he is an atheist or an idolator, he might be very hostile to Christ in his heart. But this is a worst-case scenario.
Find out if he is open to counseling, and find a good Christian counselor. Even a secular psychologist is better than nothing. You should forgive him of his faults. The only thing you are not required to forgive (to save the marriage) is unrepentant adultery or sexual immorality. If he goes through with the divorce, I think you should
not resist it (refusing to sign the papers). I think that would just make things worse. You should attend a recovery program like Divorce Care (
www.divorcecare.org), especially if the divorce gets finalized.
The only way that hope is completely lost is if he divorces you and marries another. Until then, you should wait on the Lord to see if He will supernaturally resolve the problem and restore your marriage. God can do powerful works in seemingly ordinary circumstances, but He doesn't always work that way.
In the meantime, you should work on yourself. Find out what your hurts, hangups, and habits are that hinder your relationships. Perhaps you have addictions that you don't know about, or are unsure of. Join a recovery program like Celebrate Recovery (
www.celebraterecovery.com). You need to talk things out with people having the same kind of issues, because that helps you to overcome your relational problems.
Believe that God will change you for the better, and through the witness of your faith expressed, your husband might change his mind. 1 Pet. 3:1-6:
"
Wives, in the same way submit yourselves to your own husbands so that, if any of them do not believe the word, they may be won over without words by the behavior of their wives, when they see the purity and reverence of your lives. Your beauty should not come from outward adornment, such as elaborate hairstyles and the wearing of gold jewelry or fine clothes. Rather, it should be that of your inner self, the unfading beauty of a gentle and quiet spirit, which is of great worth in God’s sight. For this is the way the holy women of the past who put their hope in God used to adorn themselves. They submitted themselves to their own husbands, like Sarah, who obeyed Abraham and called him her lord. You are her daughters if you do what is right and do not give way to fear."
But if not, at least you tried, and made improvements to yourself in the process.
TD