The second reason is just to find novelty. Some people can't stand the unchangeable feelings or life experiences, so they want to find more freshness. Online dating, and then meeting someone, is very exciting. So men and women meet to find such excitement, and then quickly retreat after excitement.
The third reason is that men have families and are afraid of girls pestering them. Such irresponsible men are mostly men with their own families. For the sake of a stable family, if you find yourself doing something wrong, stop in time.
The fourth reason is that men feel that they can't support the opposite woman. After meeting with netizens, the man found that the woman opposite was too extravagant and restless in dress and behavior, so he cut off contact after coming back.