Prince William’s relationship with Kate Middleton is reportedly on the rocks again.

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The couple – who briefly split last April – have only been on one date since Christmas and friends claim they are now drifting apart as William concentrates on his training with the Royal Air Force (RAF) in Lincolnshire and Kate remains in London.

One friend told the Sunday Mirror: “William has been distancing himself from Kate for a while. He loves Kate dearly and doesn’t want to hurt her. They are in touch but their lives are pulling in different directions. There’s a feeling that things have simply run their course.”

William, who missed Kate’s birthday celebrations last month, is said to be unsure whether he wants to take the plunge and tie the knot.

The source added: “It’s a sad thing for both of them. William fears he will not find anybody who loves and cares for him so much. But does he want to spend the rest of his life with her? It really is a dilemma for him.”

Meanwhile, William’s grandfather, Prince Philip, has also urged him to “stop dithering” about whether or not to marry Kate.

A source close to Philip told The People: “Philip is concerned William could follow in his father Prince Charles’ footsteps. Charles waited until he was 32 to get married to William’s mother Diana and that ended in a bitter divorce, before he returned to his first love Camilla.

“His popularity never recovered. Philip fears that if William keeps Kate hanging on, his popularity could ebb away.”