I am going through the same thing right now. Here is a prayer i found.
Dear Lord, You know better than anyone else that this is a difficult day for me, and for many others who are experiencing challenging times in their marriages, so I pray that I will feel Your love in a very special way. May I be rooted in Your love today, Lord, May I experience and feel the wonder and power of Your amazing grace and love. May this not be a day of sadness, but a day of rejoicing, because I KNOW You LOVE me, and YOU have ALL things that concern me and my family in the control of Your Almighty, loving hand.
Lord, I pray that on this day which might otherwise tend to be discouraging, that You will bring some special incident of hope and encouragement to me and every other man and woman standing for the restoration of their marriages. I know You care about me in every detail of my life, and I’ve often experienced that down to even the smallest of details, so bless me and my family with Your presence and encouragement today. Fill me with an extra measure of faith this day, Lord. Help me to keep my eyes on You and not on my circumstances. Help me enjoy the many things You bless me with every day of my life instead of dwelling on that one thing I don’t have or enjoy today. Show me how to express Your love by loving others, especially those who are not acting in love with me. Teach me to be more focused on the love I demonstrate and give to others today rather than concerning myself with how others may or may not love me. Show me how to walk in Your love this day that You might be glorified.
And Lord, please touch ________’s heart, who is not walking in right relationship with You today. It is the greatest desire of my heart that ________ will come to know You as her Lord and Savior, so I thank You for sending the power of Your Holy spirit to move in her life today in a most powerful and supernatural way and for bringing her to the saving knowledge of You, Lord Jesus. You came to set the captives free, but my wife now lives in bondage, so I come against all manner of sin, bondage, strongholds, deception, adultery, disobedience and disbelief in the name of Jesus Christ, from which I know Satan must flee. I cover my wife, ________, with the blood of the Lamb today and it is the word of my testimony that she WILL be saved and delivered, and that she WILL walk in right relationship with You, Lord. Please give me the strength, wisdom and grace to live in such a way that she will se You in me, Lord. I thank You that all of my interaction with her will glorify You and ask You to always remind me that every encounter I have with her will either lead her toward You or away from You.
Be Thou glorified in this day that You have made Lord; I will rejoice and be glad in it! And let Your love shine in and through me today! Amen.