Marriage - An Imperfect Gift?

If one were to judge the merit of the gift of marriage by looking at divorce statistics, marriage would appear to be imperfect. But it is not. It is our understanding of marriage that is flawed, not the gift itself.
So I have a theory. On the day that a man and woman stand before the alter of God and exchange vows, the priest, not having the ability to see into the minds and hearts, proclaims the couple "married". And so the earthly marriage takes place.
But God is there as well and HE CAN see into the minds and hearts of the couple. What if He sees that one or the other does not truly love? Can God then honor a lie? I do not believe He can. I believe that on that day, if one or the other is lying, the spiritual marriage does NOT take place because God being Truth, cannot honor a lie.
The Bible also says, that God will not be mocked. And the marriage ceremony says, "Let not man put assunder what God has joined together." It says nothing about God not being able to put assunder what man has joined together.
I believe that God will give this earthly marriage a chance but that at some point, because God will NOT be mocked, He will allow something that tests the strength of the vows. And if true love does not exist, the marriage breaks.
Is this how it really is? I don't know. But I have a problem accepting that the God of truth would ever honor a lie.