"Boss, is everything okay back there?" Cam asked when he observed the worry that creased Ace's forehead, as he drove him to the hotel.
Ace's attention was drawn to his immediate surroundings when he heard Cam's words.
The realisation that everything he thought was a dream had actually happened, and then he had gone ahead to kiss her this morning, further encouraging her to think there was something between them, which made him worried.
Also, the thought of how he had pretty much wanted to confront his trusted driver who had been by his side for years, made him feel foolish.
For the former, he wasn't worried because he didn't want her to think there was something between them. He was worried because he wanted to know her thoughts on whatever was going on between them.
Between juggling the thought of Fay, and the hopes that he was right, and Christine's flight was delayed, he was left with a throbbing head.