I think the lack of gfs comes from when girls do get obsessed with their bfs the friends do feel quite disconnected and tend to think that "their friend is gone and won't see through their concern" will rather take it in a wrong way as the friend is jealous or just not happy for.
one thing about Obsession is nikki needed a FRIEND. ANY good friend would have noticed immediately how much she changed. put me into that movie and it will end with us hiding bear's body together and me supporting her writing career