quoting haifagirl, From what I’ve observed (and I am certainly no expert), people who are fully committed do not get distracted from socializing with other couples.
I am very sorry, but a good looking sweet woman will attract a man no matter how commited he is . Men should not fool themselves – this is the way Hashem created man.
Especially that when couples socialize you dont get to see the true colors of each spouse as u do when u live with them, thus one can think “judging from this outing this must be the perfect spouse”.