Why does alex cheat on jimmy in the movie 8mile?

Alex played by Brittany Murphy cheated Jimmy in the movie "8 Mile" in order to reach her goal. By the looks of it, Wink was meant to help out with her career, just to probably end up seducing her. She headed for New York to be a model.

8 Mile/Film synopsis

The people of Detroit know 8 Mile as the city limit, a border, a boundary. It is also a psychological dividing line that separates Jimmy Smith Jr. (Eminem) from where and who he wants to be. A provocative fictional examination of a critical week in Jimmy's life.

See 8 Mile (2002) cast and crew credits, including actors, actresses, directors, writers and more at IMDb.com.

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Wednesday, April 19 2017
Source: http://www.themoviespoiler.com/Spoilers/8mile.html