Trump tweeted (for a short moment before retracting) that he might spill the beans on Cruz's wife. I took that to mean he had knowledge on some financial/political scandal. The NE piece has nothing to do with Cruz's wife except that she is the hurt party (whether the story is true or not).
MSNBC just posted a story on FR that show that the BEANS spilt had to do with exactly as you posited,
financial/political scandal only, nothing sexist or sexual.