Just because she left doesn't mean that she is not a God fearing woman. We all make mistakes, poor judgement decisions, etc. I have a hard time believing that she left without warning. Many times, the signs and red flags are there, we just fail to see them. You say that you only had minor problems. That's a matter of perspective. What might be minor to one person may be major to another person. Unfortunately, this happens frequently in relationships: parent - child relationships, friendships, working relationships, etc. It's not limited to marriage.
You mentioned leaving and cleaving.One commentary says this:
The Hebrew term 'cleave' means to 'glue' or to 'cling.' The man is the one God commands to 'cleave' to his wife. In other words, the man is to 'glue' himself to his wife. God knew that the wife would need, more than the young man, to feel safe and secure. A young girl, leaving the safe confines of her parent's home and protection, must transfer her dependence from her parents, especially her father, to the man she is marrying. For her to do this, the girl needs to feel safe and secure in the knowledge that her husband will always have her best interest at heart. From a woman's point of view, being 'glued' to her husband means her husband will guard her, keep her safe from harm, and will protect her from situations that could be harmful for her. The husband is the Protector of the Home, his wife and children.
Being secure is important to a woman, but the deepest desire of every woman is to know, without doubt, that she holds first place in the heart of her husband, a place no other woman will hold. The apostle Paul teaches us in Ephesians 6 that the man is to love his wife as (or like) Christ loved the church... He died for Her. That is security of the highest level. And deep with in each woman there is the desire to be secure in the knowledge that her husband will without a doubt give her first place in his heart, and that he will love her until death do they part.
I'm guessing your wife might not have felt safe and secure. Her lack of feeling safe and secure could have been legit, and it could have been imagined. I don't know. More often than not, society (church and otherwise) portrays marriage to be this very romantic, happily ever after fairy tale. Marriage is not a fairy tale. It's perhaps the most difficult institution known to man. Many couples experience disillusionment after marriage because they began to realize that marriage is not the fairy tale they had expected, and reality sets in.
Pray continually. Ask God for direction, understanding, favor with your wife, and reconciliation. Like someone else suggested get involved in church and develop a support system. Christian support systems are very important throughout every stage of marriage and life. We need people who have been there and successfully done exactly what we are trying to accomplish.
Another thing you mentioned is your dependence upon your wife's income. God is your sole provider and not your wife. Perhaps, God is trying to develop and cultivate your dependence and trust upon him as go through this particular trial and tribulation. Many wives have had to learn this too. All too often, wives have been taught to depend upon their husbands to provide. Then, something will happen - sickness, unemployment, divorce - to upset that, and they find themselves depending solely upon God for the first time.
I pray that God restores your marriage and strengthens your faith and dependence on him and him alone.