Princess Diana was heartbroken overdoing her sons behind after divorce from King Charles.

The former Prince of Wales, who passed away in an accident in Paris 1997, often cried over her sons, Prince William and Prince Harry after her split from His Majesty.

In book ‘A Royal Duty,’ former butler, Paul Burrell,

"The wrench of leaving behind her old life, the flat in London and the children at the kindergarten [where she worked], was upsetting," Burrell explained. "When she returned one day to see the children, all the youngsters she adored kept tugging on her sleeves and asking, 'Where have you been?' and 'When are you coming back?'"

"She found the whole experience a 'traumatic nightmare' and left close to tears."

"It wasn't any easier when she returned to her old flat at No. 60 Colherne Court, where she lived with female flatmates, to remove her most precious possessions," the former butler wrote. "She was alone with her thoughts in a flat full of memories as she polished and vacuumed. As she closed the door behind her, she had felt the urge to cry, she said."