It does sound annoying, but did you or your brother talk to her about it? Maybe she has to know
For me, I only talk to my family something that is important for them to know and not the whole details unless they want to ask me about it.
i don't think its unhealthy if you talk to your bf everyday as long as you are not bothering him in anyway. An agreement should be made between the two of you as to how often you can talk to him on the phone..
you've got to talk to him about how you feel everytime he goes out with his friends and also tell him about your expectations. that way he will know and will be able to understand your situation....