Help! Serious friend is in danger what to do?

So I've been really good friends with this girl for years and she met this guy, who she loves, but this guy is clearly taking advantage of her and she doesn't realize it.

I managed to get a conversation with this guy and took screenshot of his clear admittance of him trying to pull my friend away from me and trying to extort me for money, but she's just to blinded by love to see it.

If I show the screenshot to her parents they can put a stop to it, but the friend said if I do she'll never talk to me again. Should I show her parents and save her from this guy, and risk loosing our friendship, or should I let it go in hope she will notice and risk her being hurt? What do I do.

Updates
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I want to update the question to help people understand this is serious, as I said I have screenshot proof that this gut admitted to me his intentions to pull my friend away from me and has attempted to extort me for money in exchange for him to stop pushing her away. This friend was once very kind and never argued. Now it seems like all she does is yell and get upset over me just trying to be a friend to her.
Help! Serious friend is in danger what to do?
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