Should not we be faithful in our marriage, even if our spouse is not? God always stays faithful to His covenant with us. When we were unfaithful to Him, He brought us healing by sacrificing His own life. The Lord told Hosea (Hosea 3:1), to return to his wife although she was an adulteress. God further told him to love her as the Lord loves the Israelites, though they were unfaithful to Him.