When Pam hears "Cruz", it triggers memories of "The Cruise" and her humiliation.
After her infamous cruise, she described to her DUmpmates her futile efforts to get laid by a cheesy lounge singer on the ship.
She also described her husband as a drunken wife beater, so she couldn't be entirely blamed for infidelity.
Anyway, the bottom line is that Pam won the 2009 DUmmy of the Year by becoming the first woman in cruise ship history to come on board wanting sex with a crew member and going home high and dry.
Of course, Pam is a pathological liar, so the likelihood is that none of it happened.