 What is not a reason for Matilda to tell the librarian what happened?
The fact that in all probability such a man did not exist disturbed Matilda not in the least. Someone in Nebraska wanted to trade match books; someone in New York needed a midwestern pen pal, but it was a woman; an elderly man interested in ornithology wanted a young chick correspondent interested in the same subject; a young, personable man wanted an editorial position because he thought he had something to offer the editorial world; and— Matilda read the next one twice. First place, I don't know any Haron Gorka—" Matilda kept the alarm from creeping into her voice.
 she wanted to make sure the librarian stayed away from him
 she had been asked to relay a message to his wife  she wanted to tell someone her crazy story  she wanted to make sure the librarian stayed away from him  she had made a promise to return