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Haven't dealt with situations like this before, but I would attempt to get any male friends and say that your sister might have some altercation with the current boyfriend while they are breaking up, due to their history (something vague). If he turns up violent, you will all be close and will be able to react. Furthermore, you can pull him to the side and let him know that you know everything and if he attempts to do anything else, he will face the consequences. We are here anon whenever you need
