People often look at money as a cause for divorce, specifically when the couple does not have enough. Running into financial issues like not being able to pay the rent and living from one paycheck to the next puts a lot of stress on a marriage.
Relocating can be difficult after divorce. You do not have as much freedom as you once did if there are children involved and you share custody with your ex. You now have to think about your ex's custody rights and ability to see the kids.