When you're in a committed relationship, no one or nothing would make it fall apart, even the long distance won't matter (despite its ups and downs)..but once one of the party gets involve or even entertains the idea of someone would be better or there's a better relationship he/she could be into, then the current relationship is bound to end..
I'm sorry about what happened to you edyc08..you did the right thing though in breaking up with her..once a 3rd party enters the scene, especially in your situation, the one far away don't always win..
