I've been good friends with a for a number of years. We did everything together. I introduced her to b this year and now it is abundantly clear I have been replaced, excluded and all a talks about is b. I've never really been close to b. She is quite self absorbed. I've felt it for a while but now I see it for certain and I feel really hurt. I have lots of other friends. It just doesn't feel nice. Should I tell a or should I just withdraw - which I have already done but more completely? Anyone have experience of this.