My dear Sister in Christ, I am trusting God to do His will in this marriage. As I tell all married couples that are going through test and temptation, be what God is calling "you" to be and allow God to do the rest.
All we can do is keep your husband in prayer, but we can encourage "you" to stay holy, for God is holy. Your husband can be won over by "your chaste behavior." This goes for men as well as women. We cannot make our spouses do right, but "we" can do what is right. Yes, it hurts. Yes, it makes us angry. But, God's word says, "be angry and sin not." We get angry and want to curse, rant and rave at times. But, we must not give in to satan's devices. We know that satan will send a "Jesebell" to a man weak to temptation. Continue to hold your husband up in prayer, rebuking the evil that is trying to overthrow your marriage and family. Claim victory and power over the enemy. In the book of Acts 1:8, God gave us power over the enemy. This is an enemy that is trying to destroy your happiness and wholeness.
I know that God has ALL power. He can bring your spouse back to you "if it be "His" will and desire. Trust God to do "His" will. Stay in your word, it is your strength. Sing psalms of victory over hurt, sadness and sorrow. God gave us the victory over the serpents and scorpions that try to destroy us.
Take back through the power of prayer what the canker worm is trying to take from you.

Father God, there is an enemy that has reared its ugly head in this marriage. I rebuke it in the mighty name of Jesus Christ. Bring the salvation into this family. Bring wholeness and forgiveness to the minds of this husband and wife. Allow them to go on and raise the children that You have blessed them with. Keep them in Your care Lord.
Oh Father, comfort the heart, soul and mind of this devoted wife and mother. Give her the strength that she needs each day. Calm the raging sea that tries to envelop her mind. Give her a sweet sleep. Let her know that You are with her Lord. Let her know that You are there to comfort her. Send Your Holy Spirit to give her a peace that passes all understanding. I ask this prayer in Jesus Holy name. Amen! (It is so).