You need to check any addiction or influence that is stealing your affections and turning your heart away from your spouse. There are certain habits that can poison your home. The TV and internet can fall into this category if not used wisely. Unhealthy relationships would be ones claiming too much of your time.
The usual addictions or influences that come to mind, gambling, drugs, or pornography. Women deal with novels and magazines that affect their definition of reality. Always keep an eye out for these and make sure you remove any that starts hindering the marriage.