"The prince's move to an army camp in Dorset, with Miss Middleton continuing her life in London, is also said to have put a strain on the relationship."
"BBC royal correspondent Nicholas Witchell said: "It's a surprise, because it had seemed very stable and very steady.
He said he thought the prince's move to Bovington Camp in Dorset had "a lot to do with the final stages" of the break-up. "
"The last person on earth who's going to be pressured by newspaper columnists and television chat shows to get married is Prince William.
The Sun said the pair had reached an "amicable agreement" to part."