There could be several reasons why your ex still keeps in contact with your family and some of your friends:
Shared connections: During the course of your relationship, your ex may have formed close bonds with your family and friends. These connections might have become important to them, even after the romantic relationship ended.
Emotional attachment: If your ex had a strong emotional bond with your family and friends, they may find it challenging to completely sever those ties. Staying in touch might provide them with a sense of comfort or familiarity.
Mutual support network: Sometimes, when a relationship ends, both parties recognize the value of maintaining a support system that includes shared friends and family. They may continue contact to lean on that support during challenging times or even just for general emotional support.
Residual feelings: Your ex may still have feelings for you or hold onto the hope of reconciling the relationship in the future. Staying connected to your family and friends could be a way for them to indirectly stay connected to you.
Respect and friendship: If the breakup was amicable, your ex might genuinely value the relationships they built with your family and friends. They could see no reason to cut ties with people they care about and who care about them.
Avoiding drama: Breaking ties entirely with your family and friends could lead to unnecessary drama or create awkward situations for everyone involved. By maintaining contact, your ex might be trying to keep things civil and avoid any unnecessary conflicts.
Shared interests or hobbies: Sometimes, people maintain connections with others beyond a relationship because they share common interests or hobbies. Your family and friends may still engage in activities that your ex enjoys, providing a reason to stay in touch.
It's essential to remember that everyone's situation is unique, and there may be specific reasons in your case that are not listed here. If this situation makes you uncomfortable or causes you distress, it might be worth discussing your feelings with your family and friends to ensure they understand your perspective and boundaries. Open communication can help clarify the reasons for your ex's ongoing contact and allow everyone to navigate the situation with respect and sensitivity.