lying friend

Okay… I am currently in a relationship with a guy, Jay, I went to highschool with. We have dated on and off for the past 7 years, and have been in a commited relationship for the past year and a half. The question that I have is in regards to a very close girlfriend of both his and mine. She also went to highschool with us. The three of us have remained close through the years, no matter the status of mine and Jays relationship. However, I think that our friend, Nicole, treats me with disrespect. I am just going to list a number of things that I find odd about her relationship with him. For instance, I can suggest something to Nicole and she will completely disagree with me until Jay later suggests the same thing to her. When they go out together, she volunteers her money to cover the expense of whatever activity they are doing. If Jay and I are upset with each other, she barely een speaks to me… unless it is to tell me that I should leave him and hook up with some other guy. She has randomly brought up his dating past while Jay and I were doing perfectly fine just to create drama. Recently, the three of us went on a trip for Spring Break together. At this time, Jay and I were not together- but were in the midst of trying to work things out. Jay brought another girl to the hotel, one whom Nicole knows I do not get along with, and she didn’t even let me know. I walked into the other room to be confronted with this. Not only did she not tell me, she was excited that he had brought her back, she thought they made a cute couple. Since then, Nicole and this girl have become great friends, even though she continues to hide their friendship from me! Nicole always becomes best friends with whomever Jay is dating, I can list 4 former serious girlfriends of his whom she became nearly inseperable with. Nicole has even made up stories about me staying with other guys and told Jay about them! To make matters worse, Jay sees nothing wrong with Nicoles behavior. In his eyes, I am over reacting. He thinks Nicole is the perfect friend, she gets along with both of us and she is “mutual” to us. Anytime I say something Jay complains that I am over reacting. I disagree. I know that at one point when we were freshmen, about 7 years ago, she had a crush on him. Is her behavior out of line, or am I over reacting? How should I handle her in regards to my relationship with Jay? Thanks!