Really not sure what to do. DS got a girlfriend, she is constantly messaging/snapchtting/FT him. It seems all very intense and its coming between him and his mates. She tracks him down if she can't get hold of him via them and also seems to tease him and spend time with his mates which is causing friction. He seems so smitten, I haven't been introduced yet but I'm really not happy with impact its having and don't want him to be isolated. Say something or keep my counsel?