A marriage is a very strange thing in a way as people, including friends and relatives, don't really believe that marriages can fail.
This statement is related to those who are friends and relatives who observe the behaviour of marriage partners they know.
An example of this is when a male partner, after many years of marriage, says he is unhappy and, lo and behold, moves out not long after. Fortunately, in this example, the female partner had been overly miserable for years but never had the guts to do anything about it.
