I have been in a similar situation.. She was a girl who, to was well just a bit over-protective of her friends (can i make it any more obvious?) she had just fet this guy, he was a punk I think and he treated her badly, so badly that she left him. He said that he wanted her still but all of her friends did the right thing and advsied her against seeing him. So she realised he wasn't good enough for her and I thought had got over it. I think that is where she too came to rely on her friends too much, I mean she wasn't shy, or have anything to be unconfident about; she had a pretty face, was intelligent and funny, but when she was with that grou of girls she needed to come back down to earth as it were, and realise she cant rely on them for everything.
I have the same problem as you, some of her friends were my friends too, but now it seems that she doesnt want me near them, like im going to steal them away from her or something. Im just scared that in 5 years from now she is going to be tottaly reliant on their guidance, I mean at the moment she just sits at home, sometimes she turns on the tv and will watch for hours, he refuses to go out much. Then the other day guess who she sees? her ex. So she calls up her friends to say how shes worried hes stalking her and that I should do something about it! This is not fair on me, for a start the guy isnt stalking herm it was just a coincidence, her friends dont think so, they already know hes not and they've all got this idea that if they try to convince her otherwise she'll break down or something. Im no psychologist but she just tags along with that group, stands in the crowd and really relies on them for everything, but I think I should break up with her. I mean we are more than just good friends and I would really hate to lose her, but if this is how the story ends then I guess it is for the best.
In your case I think its too bad that you couldn't see that sometimes there is more than meets the eye. I thought that we are in love too but havent you heard the saying "there are plenty more fish in the sea". Lets go findd them eh?