I mentioned that many people separate. They marry young, and then they separate, but they never divorce because they cannot. It's possible to annul the marriage, but it's a very costly and lengthy procedure so most people don't bother. It is an issue when they remarry, but strictly speaking, legally they're not really allowed to remarry so when they marry a Canadian who wants to sponsor them, then we get into processing issues.
On February 15th, 2011. See this statement in context.