Now you and I must get away by the door; and when Wendy comes she will think her mother has barred her out; and she will have to go back with me." Now I understand what had hitherto puzzled me, why when Peter had exterminated the pirates he did not return to the island and leave Tink to escort the children to the mainland.

This trick had been in his head all the time.
Instead of feeling that he was behaving badly he danced with glee; then he peeped into the day-nursery to see who was playing.

He whispered to Tink, "It's Wendy's mother! She is a pretty lady, but not so pretty as my mother.

Her mouth is full of thimbles, but not so full as my mother's was." Of course he knew nothing whatever about his mother; but he sometimes bragged about her.
He did not know the tune, which was "Home, Sweet Home," but he knew it was saying, "Come back, Wendy, Wendy, Wendy"; and he cried exultantly, "You will never see Wendy again, lady, for the window is barred!" He peeped in again to see why the music had stopped, and now he saw that Mrs.Darling had laid her head on the box, and that two tears were sitting on her eyes.
"She wants me to unbar the window," thought Peter, "but I won't, not I!" He peeped again, and the tears were still there, or another two had taken their place.
"She's awfully fond of Wendy," he said to himself.

He was angry with her now for not seeing why she could not have Wendy.
The reason was so simple: "I'm fond of her too.