Here's the trick I use: when I am tempted or begin to think negatively about my beautiful wife I immediately stop and think about one of the many things I love and appreciate about her. Some of the things that regularly come to mind are her kindness, her laugh, her eyes (I love her eyes! They are like little suns because of the way that they are colored), her physical appearance (I am quite attracted to her), the wonderful mother of our sons she is, her generosity with her time and willingness to help others, I could go on and on but this is just to give you an idea.
Today's challenge is to identify 5 things that you LOVE about your spouse. Write them down on a notecard you can keep in your pocket or write them down on your phone or something. Then the next time you are tempted to think ill of your spouse pull out the list and slowly review it. The negative thoughts will scurry away and you'll feel "the love."