You are trying to complete the reporting of a story without all the facts. Your mind is filling in the blanks with imaginary thoughts.
You will never have a truth detector so there is no way for you to distinquish a lie versus a fact from your wife. There are a couple kinds of lies also...those that you just dont say and those that are made up. And there is the George Costanza philosophy that I think your W is living - "Jerry, just remember, it's not a lie if you believe it".