A contradiction of marriage vow and divorcing act

The customary Roman Catholic marriage vow reads like this in English:

"Do you, ____, take , ____, to be your (husband/wife), to have and to hold, from this day forward, for better, for worse, for richer, for poorer, in sickness and in health, until death do us part. I, ____, take you, ____, to be my (husband/wife). I promise to be true to you in good times and in bad, in sickness and in health. I will love you and honor you all the days of my life." 

(See http://en.wikipedia.org/wiki/Marriage_vows#Traditional_Roman_Catholic_vows .)

But it's a fact that some Roman Catholics do get divorced, at least in Canada. I wonder if that tends to turn them astray from their Catholic religion. After all, they broke their serious Catholic marriage vow.