Emotional protection.
Sheesh, that sounds so nice...

A biological explanation might be useful here, as that heavily influences thinking:
Women actually release oxytocin when you do this (their 'Tend-and-Befriend' response), and their high estrogen multiplies the effect.
However, because a man's baseline testosterone is so high, it actively suppresses oxytocin's ability to bring his cortisol spike down under stress.
Women will biologically crave emotional connection and vulnerability, while a man's biology prompts him to pull away or 'fix' things autonomously. Which might be how you reacted afterwards?"
Because testosterone and cortisol dominate the male stress response, men later experience something called a "vulnerability hangover", which is your biology snapping back, and you get thoughts like “
meh, does she see me as weak now?". And if you have a certain level of ego and testosterone, this is going to be felt more negatively - men fear any loss of respect (which is the vastly unappreciated relationship killer for men)
I gather the therapist angle is to treat this type of connection as a pit stop, not a new reality.
The car is failing - you pull in, slap on some rubber and fill up the emotional tank with her compassion.
Vulnerability doesn't mean you are not strong; it's a
tool that allows you to rest - so you can return to being strong.
You get to protect your own sense of masculine autonomy while preserving the biologically safe and deeply bonded emotions your Wife is now feeling.
Just like male fantasies are variations on a knight fighting dragons or having your head on a woman's lap...
Then, when your testosterone kicks back in, reassure her that her "tend-and-befriend" response worked great. Allowing you to pull back into your focus
without making her feel pushed away... 
{very important}
She provides the emotional safe harbour, and you show up with active care and reliability.