If you are a Christian and he is not, then that is the problem. You need to share the Gospel with him so God can reach out to him.
1 Corinthians 7:12-16 " 12 But to the rest I, not the Lord, say: If any brother has a wife who does not believe, and she is willing to live with him, let him not divorce her.13 And a woman who has a husband who does not believe, if he is willing to live with her, let her not divorce him. 14 For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband; otherwise your children would be unclean, but now they are holy. 15 But if the unbeliever departs, let him depart; a brother or a sister is not under bondage in such cases.But God has called us to peace.16 For how do you know, O wife, whether you will save your husband? Or how do you know, O husband, whether you will save your wife?"
Pray for him and treat him as a good husband whether he is right now or not. God can do amazing things with the right attitude from you. Also read Love & Respect by Dr. Emerson Eggerichs. Best marriage book ever!