That's it im done

I know i am anal about being on time but damn how much can one person take. Extremes was late again 15mins to be exact. so i just left I'm tired of waiting on her just to show up when ever and not say sorry running late. I'm so done with her flaking out on me. I told her I waited for 15mins and I left I'm tired and sore I can't be friends with someone who doesn't understand the concept of time.