Chloe, 24, and Louis, 25, returned from what friends say was a make-or-break trip to Australia and Thailand three weeks ago.
But only Louis returned to the marital home in Clapham  -  Chloe went back to her parents.
As childhood sweethearts, the couple started dating at £24,000-a-year Stowe School when they were 17. Within a year Louis was living with Chloe at the Delevingnes' £10million townhouse.