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It's good that you're worried about your friend and want to help her. I suggest you get help from your other friends also. Tell them about that guy and ask them to tell her also. If only you say that he's not good he might manipulate her into thinking you're looking for a chance, so team up against him. I don't think she'll disregard everyone's opinion. Also gather proof and if possible find someone she sees as trustworthy, whose opinion will weigh on her and explain the situation to that person too.
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