I have to completly agree with artistall.
If your fiancee truely loved, cared and respected you she would respect your feelings about her friends.  When you express to her how you feel and how she makes you feel she should respond to that in a loving, caring respectful way not argue and fight with you about how you feel.  If she turely loved and cared about you as much as a fiancee should, she would want to spend every free moment with you.  Not with all of her friends.  It sounds like she completly does not respect you and does not make you any priority.  Don't waste anymore of your time Maki.  You deserve better!