Yes, I agree that people including spouses, can sometimes change in unforeseen ways. Sometimes that may be that the couple did not really know each other well enough before they married. But I have also seen enough marital split-ups over the course of the years, and frequently they were predictable, even by third party observers such as myself. One party was immature, one was uncommitted, one was hanging on to his college days instead of joining into a new life with his wife. It seems that often friends and family might look on, not interfering, but thinking to themselves, “oh, this is going to be a disaster.” But the one getting married doesn’t see it.