Is my best friend being cheated on, very nasty case, what can I do?

Anonymous
So there's a lot of details and things i can't discuss right now about the entire relationship, but lets just say; it was controversial from the moment it started

Now it turns out, after some suspicion by my best friend himself, she appears to be part of a groupchat where people ask for her nudes...
She even has this private ig page (which my friend is a part of obviously) where she shares very suggestive pics. To make that worse, among those followers are ex'es and people she met online...

Im not supposed to say this, but the fact that she is underage only makes this all so much more troubling and disgusting

I've told my friend its an utterly disrespectful and dirty situation but what else can i do?
Cause im afraid he's being (ab) used mentally and she will just continuo creating these overly dramatic situations and he will just keep giving in
Is my best friend being cheated on, very nasty case, what can I do?
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