Princess Cromwell and Her Six Brothers
He was just creating a loving husband image.
Even the messages sent over, the numbers used, are not their own.
There must have been another phone number, leaving that aside, if that's the case, then those two must have had secret numbers too.
Amelia had studied behavior analysis and was good at dissecting the psychology of criminals, making it easy for her to create a personality color chart for characters.
From the messages received, and the fact that she would come with her best friend, it's clear that she's someone who loves to show off. A person like that, you can't expect her not to flaunt her relationship online.