Is this a true friend (very short)?

My ex (5 years together) and I broke up for a year now. ANYWAY, she claims i am her best friend and whatever but then books a lakers bball game with her friends on my birthday. I told her it's fine go with them (of course im lying =P) and she eventually says okay. It hurts to know I devoted so much time into this girl and treat her like gold still (I dont like her anymore but I do care very much for her) and she pulls something off like this.