Troi made note of Xelo's inappropriate behavior in her personal journal. (TNG-R: "Dark Page")
The log entry concerning Xelo's thoughts towards Lwaxana were created for the TNG Season 7 Blu-ray release.
In the short story "The Ceremony of Innocence is Drowned", it was revealed that Xelo was actually fired when Lwaxana Troi discovered he had kept numerous keepsakes of her first daughter Kestra. Apparently, she 'nearly fried his brain' before firing him.