Your last minute change would have made me assume that you’d changed your mind while I was out of town. The last minute nature of it would have made me think you’d forgotten until that moment, and had just realized you’d double booked yourself for the evening.
I would have backed out, but because I’d have been convinced, based upon your behavior, that it was what you really wanted but were too much of a gentleman to come out and say it.
If I’d put a lot of thought into the possibilities, maybe had my hair and nails done and gone to considerable trouble to look nice for the date, I might also be fairly offended that you hadn’t just said something the day before. All that nervousness and botheration for a guy who had changed his mind in the interim? Bah!!
And for all you know, she was missing something she’d wanted to do with her girls, because she had a previous commitment with you. You see, some folks consider social commitments to be sacrosanct. We don’t consider other options, no matter how much better they might be, once we are booked.
In fact, as I sit here, I am convinced that you really did change your mind. It seems clear that you were not greatly looking forward to having some time to spend just with her. Dividing your attention and hers was preferable enough to you that risked changing, last minute, on a first date, in order to achieve it. You MUST have known this was a risky thing to attempt, as you are at pains to make sure we know you left the choice with her.
And you didn’t say “Heck no, sorry boys, I have a date with an angel tonight . . .”
While it would not necessarily be appropriate for a romantic partner to expect that level of priority every time forever, if the first date is not a priority to you, she is justified in assuming it never will be. And texting (not even calling, so you could gauge her response?!?) on the way to the restaurant?
Seriously, dude, you bailed. Why you don’t want to just admit it and move on is the only thing puzzling me. She let you off the hook. Go do what you obviously really want to do.