Damn, I have to admit I was wrong about never taking advice woman about relationships. Velvet is right on everytime. And, sugarplum is looking at thing objectively also.
Lestat, take it from an expert. No one has been dumped more than me. However, (like you) I have used the experiances as drive to improve my body, income, and self happiness.
Like vel and sug are telling you women (and some men) take pleasure in knowing that they still have an effect on you.
My suggestion
1. e-mail her back saying "I was having at the company party, but I was late for something else and had to leave." Thats it no Hi or bye
2. Goto the game like its no sweat. (I know its hard)
3. Say exactly what Matt sky said. Except, I would throw in the optional joke like.."keep your eye on the ball" or call her "Wiff" or something.
4. I wouldn't bring a chick unless she was flaunting a guy in your face. She already knows you are seeing other girls. Trust me girls find this shit out
5. Do not get angry or tell her not to contact you or go anywhere you will be. (I know its hard) And, definately dont try to get revenge. Your revenge will come later. (thanks in part to her dumping you) I promise she will regret her actions when she see's how much you improved your life, how good you are compared to the others, and how happy you are and could have made her.
Batter Up!!!!!!!!!!!!!!!!