Girls, why is my ex girlfriend giving me dirty looks?

she cheated on me and she ended it and got with another guy a week later haven't spoken since, I went to the movies with my dad to watch the new avengers movie as the movie ended and the lights came on she was with the new guy she cheated on me with she was walking to the exit and she looked behind and noticed where I was sitting and she gave me a dirty look.

I frankly couldnt care because I am single and away from this crazy cow.
Girls, why is my ex girlfriend giving me dirty looks?
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