My roommate and I are in different sororities as well. Sometimes it was weird not going through the New Member period together, but in the end it worked out well, because we probably would have gotten sick of seeing eachother all the time if we were in the same sorority.
Either way, the only thing that matters is that both you and your roommate LOVE your own different sororities...and have fun!
Erin
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Rise and shine and become a Kappa Gamma!