Is Staying Single Selfish?

In a review of Eric Klinenberg's Going Solo: The Extraordinary Rise and Surprising Appeal of Living Alone, Benjamin E. Schwartz critiques the single life:

If someone in my past forsook instant gratification to allow me to become who I am, does this obligate me to do the same? Am I responsible for ensuring that certain values outlast and outlive me? America’s strength is a function of many factors, but certainly one of them is that for generations citizens answered these questions affirmatively. The popularity of "going solo", which Klinenberg’s data strongly affirms, doesn’t necessarily mean that Americans are answering "no" to these questions. It’s worse than that: As more of us spend more of our lives alone, we’re less likely to even confront them. By default, we are now allowed the novel conceit that selfishness is a virtue.

Previous discussion of Klinenberg's book herehere and here.