Those people who flirt with you suddenly don't really want to flirt with you.

This view might be true in some cases. Sometimes, people might use sudden and unexpected ways to flirt with others in order to attract their interest and attention or to surprise and excite them. However, this behavior did not necessarily mean that they really liked each other or wanted to establish a deeper relationship with each other. Some people might use flirtatious methods to test their feelings for each other or to find a short period of excitement and fun. They might not really care about each other's feelings and just want to make themselves feel satisfied and happy in this way. Of course, this did not mean that all flirting was for this purpose. Some people might have sincere intentions to establish a deeper relationship with the other party. But for others, they might use sudden and unexpected ways to test their feelings or to find short-term excitement and fun. In short, we should be cautious and vigilant about any kind of flirting method. We need to carefully consider the other person's feelings and whether this behavior will really help build a deeper relationship. If you really want to build a deeper relationship with someone, you should take a more sincere and natural approach instead of using sudden and unexpected flirting methods.