1 If you gave a commintment you are obligated to keep it, nothing to discuss, next time do not commit
2 Anybody in chinuch will tell you, if you started learning with someone or starting dorming with someone and you think after two or three hours with the person (a usual date length) it is not working out you should give it more time see if it will work out this is not any different
3 The girl obviously spent time and money to come in based on your word, should someone in business invest on your word?
4 I know several people that are married to because either the boy or the girl had commited to another date even though they felt the other party was not for them
5 Lastly you are doing yourself a disservice by saying no after one date, you never know maybe she was tired from the traveling, or something else happened that she was not up tp her usual self.
6 BOTTOM LINE YOU SHOULD HAVE GONE OUT AGAIN