Marriage doesn’t guarantee that you will be together forever, it’s only paper. It takes trust, respect, commitment, understanding, friendship and faith in your relationship to make it last.
The marriage license is just a piece of paper. A true marriage is made by the other "ingredients" listed above :)
They both have got to believe, love and accept God in their lives and marriage and putting him first at all times, including the trust and the rest that follows, in order for the marriage to work.
It also takes honesty and loyalty and not cracking onto other people after you’re married.