Jesus said, "For this cause a man shall leave his father and mother, and shall cleave to his wife; and the two shall become one flesh."
Marriage is God's design. Do it His way, it will work. But if you insert human free will, follow your carnal nature and listen to subtle suggestions by the enemy of your soul? Well......The results are evident. (1 out of 2 fail) Click for marriage article: 
Marriage: Two shall become one. (Taken from The Real Deal)
We're now 40+ years of marriage. Still going. (Why? 4 words: Jesus, commitment, passion and apologies)
