What is the theme in What We Talk About When We Talk About Love by Raymond Carver?

The central theme of this story is love. The two couples spend the evening drinking gin and discussing the nature of "real love." The narrator explains that "we somehow got on the subject of love." It is Mel who insists on returning to the topic of love. He believes that "love was nothing less than spiritual love." They then turn to the topic of Terri's abusive former husband Ed, who eventually shot himself in the head and died. Terri and Mel, both of them married for the second time, debate whether or not Ed really loved Terri. She claims that Ed "loved her so much he tried to kill her." Mel insists that "that's not love."