You just didn't want to persue a romantic relatioship )
I think you treated him poorly.
But that's the whole point of the second date, the potential of pursuing a romantic rel@tionship. Once the OP realized her feelings wouldn't be going in this direction, I think she was right to call it off as it would be wasting both their time. I think she handled herself fine and the bachelor was smarting a bit at rejection after the first date. How would he have handled rejection after the second date?
So the bolded sentence is where we disagree. Though I will say the disagreement is fairly mild. It's a matter of timing. I am firmly of the camp that one can turn down
a date or any reason whatsoever, no matter how petty. Don't really like him, hair too long, smokes, has kids, hates cats, eats sushi, doesn't eat sushi, pronounces the letter r in an odd fashion, walks too fast, drives wrong car, eyebrows are crooked,wears too much blue clothing..all fine by me. If you don't want to date the person, it doesn't mater why. Attraction is a very personal thing.
However once you have agreed to the date, you (in my reading of etiquette) are bond by the same social conventions that hold that an RSVP is written in stone (with the safety caveats I listed in my previous post) and you cannot beg off because of a better offer (it doesn't matter if the better offer is a dashingly fabulous long term crush or a desire to eat ice cream on the couch) . Once you say you will have the date, you should go.