The people who love only once in their lives are really the shallow people. What they call their loyalty, and their fidelity, I call either the lethargy of custom or their lack of imagination. Faithfulness is to the emotional life what consistency is to the life of the intellect – simply a confession of failure.
– Oscar Wilde
The Picture of Dorian Gray, Chapter 4. Lord Henry has no time for lifetime love or fidelity, he makes clear to Dorian. After hearing Dorian confess to loving a girl after knowing her just three weeks, Henry rubbishes being faithful to one love as a "confession of failure" and bad for your emotional life.