Unfortunately, these types of situations occur when people have no boundaries. You can only control yourself, your behavior, your reaction, and your feelings. You can't control your sorority sister or your ex-boyfriend. I think that you should carry yourself with dignity and self-respect and not talk about this sister. She did what she did and you can't change that. All you can do is learn and grow from this experience. Some people are worthy of your trust and friendship and some people aren't.
I hope that the summer break gives you the time and space that you need to heal from this painful experience.
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