There could be various reasons why a girl might choose to remain friends with her ex and his family and friends on social media after a breakup. Here are some possible explanations:
Emotional attachment: The girl may still have feelings of friendship and care for her ex and the people associated with him. Even though the romantic relationship has ended, she might value the bond they had and wants to maintain a platonic connection.
Mutual respect: If the breakup was amicable and both parties parted ways on good terms, they might still respect each other and see no reason to sever all ties completely.
Shared interests or hobbies: The girl and her ex might share common interests or hobbies that brought them together in the first place. By staying connected on social media, they can continue to share updates related to these interests.
Social circle overlap: During the course of the relationship, the girl might have formed her own friendships with her ex's family and friends. Even though the romantic aspect is over, she may wish to maintain those individual connections.
Nostalgia and fond memories: Some people hold on to their past connections because it reminds them of happier times and memories shared with their ex-partner.
Avoiding drama: Unfriending or blocking someone after a breakup can sometimes lead to unnecessary drama, especially if there are mutual friends involved. Staying friends on social media might be a way to keep things civil and avoid potential conflicts.
Closure and moving on: For some, staying connected on social media allows them to see that their ex is doing well and has moved on, providing a sense of closure and allowing them to move on themselves.
No ill feelings: If the breakup was not acrimonious and there are no hard feelings between the two, they might see no reason to cut each other out completely.
It's important to note that every individual and every breakup is unique. People have different coping mechanisms and reasons for their actions. What might seem puzzling to others could be a personal choice that helps the individual navigate their emotions and relationships after a breakup.