Odd choice you might be saying to yourself. But think about it, he loved Nancy completely, unconditionally, and without question for a very long time. He may not have been the model father but no one ever questioned the love he had for his wife. To be loved like that is truly amazing and something to be cherished.
I’m blessed for I too am loved like that by DH. Though we may fight, like every couple, I have never doubted his unconditional love for me.