While a tuk tuk would be my choice of transport in Thailand, it's common knowledge that tourists ride bikes in Thailand - just as it's common knowledge that restaurants get full. She didn't think she would ride a bike, but when she got there she was confident that it would be OK and changed her mind.
The OP's girlfriend did not have a *contract or agreement* that she would not ride. She simply thought that she wasn't going to do it and subsequently changed her mind. The OP has clearly stated in is post #6 that "I didn't even ask her not do it in the first place". If he didn't ask and she didn't agree, where is the contract?
He was not waiting for her to be somewhere she wasn't. She didn't leave him stranded while she went riding. In short he was not inconvenienced and she did not set out with intent to deceive him. And after all, the definition of a lie is in the *intent* to deceive.
The only contract I can see is where she agreed to wait for him so she could eat a fruit with him. However, it's common knowledge that it's rude to refuse food offered by hosts (unless you dislike the food - but even then, it's good manners to eat a little if you can). Therefore, this common knowledge of manners should explain why she didn't wait for him. Besides, how special can a bit of fruit be??? I mean, really.
Last edited by basilandthyme; 01-07-13 at 03:21 PM.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.