Falling in love with someone usually makes that person feel as if they will stay with that person forever. Their feelings will never change. People want to feel that they are marrying their best friend.
Usually, people have the idea that they marry their best friends, but people have other friends outside of their romantic relationships. These friends are things that they go out to eat or work with. One of these friends could be their best friend.
Therefore, it is good in all relationships that people have friends and even best friends outside of their marriage. So, people like to say that marriage to their best friend will last forever so that they feel that they will be with this person forever.
When someone gets married, they want to feel that the person they are marrying is their best friend. If they are their best friend, then they will want to be together forever.
However, that doesn’t always happen like it does in the movies or in fairy tales. Instead, people divorce for all sorts of reasons. Some people will even say that they still love their significant other whom they divorced and they will always love that person, but they had to divorce their best friend.
Therefore, this statement that marriage to your best friend will last forever is not actually true. It is just a statement that someone usually says to themselves in order to make themselves feel that their marriage will last forever.