Girls are older than boys. Boys used to call girls Qian Jie. When they knew that the girls liked him, they changed their names to Qian Qian or their full names. What do you mean?
There are two possibilities. First, this boy wants to get closer to this girl and develop further. Girls chase men's barriers. Boys know that girls like themselves, and it is estimated that they are a little excited! Second, boys want to keep their distance from girls and don't want to be too close. Brothers and sisters are too close, which makes girls like themselves, but they don't want to continue this development with girls!