"I have no way of knowing whether Huma, for whom I have great respect, is responding out of new motherhood, the Stockholm syndrome or a mystery."

Said Gloria Steinem, quoted in a NYT piece called "Many New York Women Are Baffled at Loyalty Shown by Weiner’s Wife."

Why puzzle? Go with the simplest solution: They had an understanding. Must I explain the world to Gloria Steinem? I doubt it. I believe she is bullshitting, because what is the basis for having "great respect" for Huma Abedin? None!

And it's perfectly silly to say "Stockholm syndrome."

Stockholm syndrome, or capture–bonding, is a psychological phenomenon in which hostages express empathy and sympathy and have positive feelings toward their captors, sometimes to the point of defending them. These feelings are generally considered irrational in light of the danger or risk endured by the victims, who essentially mistake a lack of abuse from their captors for an act of kindness. 

A wife is not a hostage! She's someone who chose a life mate and voluntarily made vows to stand by him.  Transferring that concept onto marriage is ridiculous (unless there's some actual imprisonment going on).