It's not always a question of sense Mocha. This is real life in real time! There will always be regrets.
The reason I would have sent that text is partially because in my head
I'm Sumra, Princess of Zamunda. I consider standing up one of the worst dating offences and Princesses do not get stood up! Fair enough he may have second thoughts about me, but I deserve to be told politely.
Usually when someone obviously values you less than you value yourself you will leave then and there. That's why I would end it immediately. A man standing me up doesn't match with my view of what I deserve and what I'm worth. Its more like reacting to a feeling that the situation is not right than having good sense possibly. Everyone has different trigger points.