Why Don't people tell people when they are going to break up with the other person?

My girlfriend ****** ****** (I will not post her name or she would be embaressed) does not want to tell me in person that she broke up with me I am mad! she was going out with a !#@$ behind my back that jerk! anyway I am now a single dude hnign around in nowhere land hoping for someone somewhere to....................life sucks.