Longshan temple in Taipei. It is an alian culture after all...
Usually in such cases, the Canadian or American (could be another Western nationality as well) man does not understand, why his girlfriend cannot accept the fact that she gets dumped. "This is perfectly normal in the 21st century" is what is usually written in the forums, so she must be mentally disturbed to react this way.
Taiwan is full of dragons (here Longshan temple). Before having one as a girlfriend, you should understand the very basics.
What is forgotten is, that Taiwan's culture, originating directly from Chinese culture (to the point of actually being Chinese culture) is totally different when it comes to "mating rituals" than Western culture. A typical middle class guy here will first get his career sorted out. And when he is a little past 30 and has a good job and some money on his bank account, he will get his first serious girlfriend and by that time they will talk about sex. Many couples will wait with sex after marriage, others will do it within the preparation time, which you may call "engagement". However, a Taiwanese engagement is actually the marriage party of the bride's family (where only the groom and wife family take part) and the real marriage party (with bride and groom's family) follows straight afterwards.
Chinese and Taiwanese people are very serious about relationships, there is some kind of "family discipline" originating from the Confucian idea to find and fulfill your place in society. A family is a functioning and well organized part of the whole society, which parents on top and then the children with sons first and then daughters. Even the children will be sorted according to their birth order. The first son of the family is the most important child and second and third son have to listen to him!
Finding a steady partner in a relationship means finding a husband or wife in Taiwan and that is not for fun in the first place, but part of organizing your life.
Going out with a foreigner is socially acceptable for a girl in Taiwan, but viewed with some kind of concern and skepticism. Having a Taiwanese boyfriend is more easy for a Taiwan lady, because if they break up, neighbours, colleagues and family will NOT assume they already had sex. However, having a longnose boyfriend means, they surely HAD sex in people's opinion. Honestly, I do not believe in a Western guy dating a Taiwan lady for a few month without it, as Western culture sees intercourse as a part of longer relationship between girl and boyfriend nowadays - Taiwan culture does not.
But when a man marries here in Taiwan, he wants a virgin or at least a woman which can pass in public opinion as a likely virgin. It is about saving face. The actual fact of being a virgin or not is not so important as the public opinion about the girl. Now this is unfair for women and women's lib still has much to accomplish in Taiwan, but those are the facts of life here.
Conclusion is, a Taiwan girl who had a Western boyfriend and has broken up with him will be regarded as a non-virgin and has difficulties of finding a Taiwan boyfriend or groom. She has to look for divorced man, which is not easy in a society where divorce is regarded as a dramatic personal failure which can even get you fired in your company. A lady of 28 or 32 will have to look in a different age category as well to find a divorced man.
If a foreigner gets a girlfriend here, it is very likely she is a virgin. Having intercourse with the girl and then dumping her is a personal catastrophe for the lady. She is out of the marriage market, a no-go zone for the Taiwanese guys! Not because she had a foreigner, but rather because she is an OBVIOUS non-virgin now. Remember, in a Confucian society, it is about what people THINK, not what actually IS.
Having a non-virgin girlfriend could lead to the same drama, if the girl thinks after a few month of relationship, she finally found her Mr. Right and marriage will be finally on the horizon. And then ZAP. "Darling, I am not into a longterm relationship now. BYE". And then... the dragon will show her claws, because those cute and small Taiwan ladies are courageous and brave women. Which makes them great partners in life (but not the most easy ones if you are a Western guy). Dumping them after having gotten serious with them is not a good idea.