Would you just move on?

How would you feel if you were me, heres the situation..Me and a ol friend of mine names Kay, we were really close during high school, I had introduced her to another friend of mine named Tamia, they met a few times but weren't really close or whatnot, so anyhow,I recently get back in touch with Kay, after five years, and we talk and hang out, then I moved away for almost a year, now during that time, Tamia, calls her and invites her to her fathers wedding,calls her all the time, goes to her mother house unannounced, adds her to her myspace, and not only that she does that with my- ex fiance, she asked my ex-fiancee to call her to buy some oils from her, and so now, Kay won't call me, she will only call Tamia, if she wants to go out,and I notice that when we did go out, she will not give me eye contact, and now all of a sudden they are acting like they are best friends, going to the mall together, trying each other clothes on, and we are all in our mid twenties.