It is extremely difficult to get into the squad let along managing to stay on the team as a "veteran" which Melissa did. The weight requirements are extremely rigid and the Dallas Cowboy Cheerleader organization is very very picky. They only want the prettiest girls.
Because she was a DCC, Melissa was also on the CMT show "Dallas Cowboy Cheerleaders: Making the Team". You can watch full episodes from the second season here (under 'Featured Videos'):
http://www.cmt.com/videos/misc/175402/dallas-cowboys-cheerleaders-204-segment-1.jhtml?id=1569546
It is definitely true that Jason did not dump for Melissa who he called 'Lissa because she was unattractive. She is a very beautiful girl.
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