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Love—and praise—specifically.
It's not wrong to say, "You're the greatest, and I love you." It's just not sufficient. In the early days of your relationship, there were probably many, many wonderful qualities you noticed about your spouse: his dry humor or way of making guests feel welcome. The longer people are together, the less they mention these kinds of details. Think about how specific your criticisms are: "Why do you put so much water in the pasta pot?" or "Why have you come home with five bananas when I told you three are going to be rotten?" Be exactly that specific with your praise too.