what do you think?

hello guys,
I had a very weird situation 2 weeks ago, it was my graduation party in university and we are supposed to set it ourselves and invite our lecturers and some close family members and friends
I was trying my best to make it nice party..I prepared almost every thing with group of friends, my best friend was working with me for the entire week but quess what????
she quit the party and travelled to another city without even telling me why?
she told another one to let me know .the reason I got mad cause we are real close friends for more than3 years...
what I did is I carried on and did the party without her..
and thank God it was successful even though I was totally shocked!!!
I excpect an apology but she didn't call...
I din't know should I take to her first even I'm so mad cause she had put me in embarrassing position in front of every one??
so what do you think???

thanks alot sweetie for your reaction...no1 answered my post but u so thanks
I did confront her and I forgived her but I don't know why I felt terrible after that I think I she had her own reasons that's why I respect our relationship and I remembered the days we had toghter ....
thanks