Hello I need immediate help please! So I changed my whatsapp number recently because my old sim card got deactivated. However, I am still using the same device.Now Airtel has given my old number to a new customer and he has registered on whatsapp using my old number. This person sent a message on one of my groups and I am very scared that he has access to all my old chats and pictures. This information is very private and I am very scared that he has access to it. All my old chats however, stayed on my phone even though i changed the number. Can he see all my chats ? Im freaking out..please help!