1 If she is very sad and has been crying, you can tell her to cry loudly and vent her inner dissatisfaction and troubles, and she will feel much more comfortable.

2. If the girl is very upset and wants to tell you about her sadness, then you can accompany her and listen to her quietly.

3. When the girl is tired of crying or saying that she is tired, you can accompany her out to eat some food, or take a bath and sleep. When you wake up the next day, many things will be forgotten.

4. You can also provide her with some analysis and suggestions and tell her how to solve the problem after her mood is stable.

5. If a girl is unhappy because of her boyfriend, as a third person, she can tell her boyfriend about the situation and ask the other person to comfort her.

6. If the girl's mood has been very bad and there is no sign of relief at all, you can also consider seeking help from a psychologist to provide professional help.