OP is free to change his mind. When she acted like an unreasonable brat and canceled I'm guessing he indeed lost interest in her. You can claim it's an ego defense, and maybe in the case of the OP it was who knows for sure, but when you don't have outcome dependence it's called just having dignity.He did lose. He sought out to fvck her, BUT he didn't.
Now if he was off-put by her "Where do for work," comment, he could have told her to get lost. But he didn't.