Joshua Davies, 16, was promised a full cooked breakfast if he carried out his threat to murder Rebecca Aylward.
Davies and Rebecca, 15, had split up but she went to meet him hoping they would get back together.
Rebecca even bought new clothes for the 'date' unaware Davies had been boasting to his friends how easy it would be to kill her.
The obsessed schoolboy had plotted to give her deadly foxgloves, drown her in a river or throw her off a cliff.
But instead Davies lured happy and fun-loving Rebecca into woods where he battered her to death with a rock.
A five-week murder trial heard that two days before the murder Davies texted his friend to say: 'Don't say anything but you may just owe me a breakfast.'
Judge Mr Justice Lloyd Jones today lifted an order preventing the boy from being named and photographed.
He said it was 'in the public interest' that he should be identified.
He said: 'This is a crime in a small and closely-knit community and it's right that the public should know there has been a conviction and who has been convicted.
'I accept that the weight given to the welfare of the boy changes now he has been convicted of a very serious offence.'
There was clapping, cheering and then tears from Rebecca's family in the public gallery at Swansea Crown Court as the jury found him guilty on a majority verdict of 10-2 after 20 hours deliberations.
Rebecca's mother Sonia Aylward, 39, gave a quiet smile as the verdict was announced.
Davies, wearing a pale open-necked shirt and dark trousers, showed no emotion as the jury returned their verdict but was in tears when the judge addressed him.
But his family, sitting away from the Aylwards in the lower public gallery, gasped at the verdict.
Until now there was a ban on Davies being publicly named - but the court yesterday lifted an order. Read More