Sure there'll always be pple who say one thing but act the
other, doesn't matter if they're fufilled or well to do. Besides
pple marry for many reasons apart from love, so it's not
surprising.
Some point in time if their spouse are not able to satisfy their
sexual needs, they'll be looking elsewhere for gratification.
But why should this bother u? Ur choice to remain faithful to the
person u had professed (or were to profess) ur love during
solemnisation should not be influenced by e bad practices that the
few bad hats in the society chose to adhere. I still believe that
majority in our society are faithful to their partners including
those who're not married.