Nothing he has not seen
The girl was a little surprised that even though Jackson was a big superstar he was so humble and caring towards her. She was suddenly transported to the time when she was on her honeymoon with Austin and she clearly remembered when they were on a beach and a girl was trying to flirt with Austin constantly. Even though he knew that Linda was getting a little disturbed by the constant flirting of the girl, but nevertheless he resumed talking to her.
Later when she had confronted him, Austin had simply smirked looking at her.
"Why are you so jealous Linda? Just because girls find me attractive it is not my fault. You really need to keep your insecurities aside."
As they entered the shop, Linda was constantly remembering Austin's words and they were rotating in her mind. She did feel bad about Austin's behavior but nevertheless she thought that probably she was overthinking and it was normal for girls to flirt with even married men.