Prince Harry is ‘regretful’ after his relationship with Kate broke down ‘spectacularly’, claims a royal expert.

The Duke of Sussex and the Princess of Wales enjoyed a close bond before Harry’s relationship with his family became fractured after he made multiple public bombshell allegations about his relatives.

Kate revealed her cancer diagnosis to the world on 22 March, however it is understood neither Harry nor Meghan were told of the announcement ahead of time, laying bare the extent of the fallout.

Royal biographer Duncan Larcombe told the Mirror: “Bombshell news like Kate’s puts things into perspective and Harry isn’t immune from being filled with regrets and what-ifs. Kate was like the sister Harry never had and he is probably full of regret at how his relationship with her and William has collapsed so spectacularly.”

Harry is set to return to the UK this May to host an event for the Invictus Games, sparking the possibility he will meet with his estranged in-laws as Kate undergoes treatment.

Yesterday, Meghan made her first public appearance since the revelation of Kate’s health condition and read to children at Los Angeles Children Hospital for a ‘literary healing’ session