Christian was not the jealous type of man, despite being protective. So you really didn't understand when you saw him in a bad mood as you got into the car after an actor your age interacted with you almost throughout the entire awards show.

His expression was neutral, but he was quieter than ever.

He is afraid of being exchanged for something newer, something that suits you better. Christian knows he's immature, but he clearly can't help but be worried.