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Exoskeleton - So I don't know if this will make sense to you, but I am a Cancer zodiac sign and I am so sensitive to these kinds of things that I react this exact same way. I would feel extremely hurt too! My sensitivity gets so bad too, that if my friends tag each other on Facebook and don't mention me, I immediately withdraw and feel left out.
Your feelings are valid to me. But like the other poster said maybe there were some reasons why this happened - I would hate to see you lose your friends over a misunderstanding. It's hard when you're dealing with BPD too, but if it's bugging you that much, is it possible to tell one of them how you're feeling? I know confrontation isn't my thing either, but I wouldn't want it to eat away at you and make you depressed. Consider it, maybe it will help!