When we are trying to impress someone or when our ego's are fragile, we do everything in your power for acceptance, and validation.
He is being on his best behaviour, showing this new person he's all that and a bag of chips. He needs to keep up apprearances.
He wore out his good side with you so he needed someone new to show it to and BELIEVE ME, she will get the bad side of him soon enough
There is no miracle recovery there.
When my ex of 15 yrs left me for someone else, two weeks after he moved out, someone we both knew came up to me to tell me she saw my ex with his new GF and he was buying her a cell phone.
OUCH!
It hurts!! But when he was done trying to impress her with his small d*ck and HUGE ego, he was trying to get me back...........Of course, I laughed in his face!
Stay away from anyone who knows your ex or if someone is about to tell you about your ex, tell them to STOP!