linear writes:
Example: Even if we were married for only one day, my wife cannot be compelled to testify against me in a court of law. That recognizes the intimate relationship (we know a lot about each other) we have and does not force her to break that relationship.
That's a pretty good example. I want to add the caveat as an fyi, which does not undermine your example in the slightest, that your wife actually could be compelled to testify against you for anything you did BEFORE or AFTER you were married, just not something you did while you were married.