The ordinance which makes this possible is called temple marriage or sealing. A marriage that has been sealed will last beyond death and throughout eternity. We believe that those who enjoy this blessed state will have everlasting joy. There are counterfeit notions which, on the surface, match our belief in eternal marriage. However, these beliefs actually depict marriage in unrealistic ways and may encourage us to improperly make or break this sacred covenant.
Many love stories present the idea that there are specific people designed for each other.
If we don't find such a person, we should keep looking. If that person dies before we meet, we are out of luck and will never find true happiness. Once we find him or her, it will be smooth sailing with them forever. We will always agree, we will not have problems, and we will not be interested in anyone else. If we do disagree, if problems should occur, or if we should desire someone else, then clearly we were mistaken.