
I think that there is a more important theme behind this. I believe that the boy was afraid of dying inside the orphanage, so he unconciously sends the butterflies away. He does not want them to suffer inthere the way he has suffered.
“Avanti,” George said. He looked up from his book. In the doorway stood the maid. She held a big tortoise-shell cat pressed tight against her and swung down against her body.
“Excuse me,” she said, “the padrone asked me to bring this for the Signora.”
At that very moment the girl knew what she had to do. She had known it for a while now. Actually she had known it from the very first time she had seen the hotelkeeper. She wanted a man that could give her what she wanted and treat her like she wanted, a man that could give her a cat whenever she asked for it. And George was not that man. He was not even closer.
So, the girl took the wet cat, looked at George for the last time (he knew it was the last time), and went downstairs.