She had already devoted her own to make him happy in the hope that one day he would do the same.
He failed to notice that he was the centre of her universe and went about his life dedicating his world to himself.
He didn't keep the world she had given him turning. He didn't notice as her universe began to collapse until eventually all that was left was a black hole.
She had her world but it no longer belonged to him so she packed it up along with her universe and left.
He asked her to return. He promised her the world, the moon, the sun and the stars. But it was too late.
She rebuilt her universe around herself.
She replied "Do not promise me the world, for I have my own".