Why do boyfriends often leave without saying hello?

Boyfriends sometimes leave without saying hello for the following reasons:

1. Unconscious behavior: He may not realize that his behavior will make you feel uncomfortable, which may be an unconscious behavior.

2. Carelessness and informality: Some people may be careless, not paying attention to details and not considering other people's feelings. This may be due to his personality, and he may not realize that his behavior will bring you trouble.

3. Disrespect your feelings: He may not respect your feelings and think that your feelings are not important, so his behavior will not consider your needs.

4. Bad communication habits: He may not have developed good communication habits, and he doesn't know how to effectively communicate with others and express his thoughts and feelings.

If you think this problem has affected your relationship, I suggest you communicate frankly with your boyfriend and let him know your feelings and needs, so that you can better understand and respect each other.