Not sure what to do, need to have a Facebook messenger convo removed and getting no help

Does anyone have suggestions on having a Facebook messenger convo removed and permanently deleted from both sides?

I have been deeply betrayed by someone I cared about, trusted, thought was a friend and only tried to help. They are trying to ruin all my relationships with friends and family and slander my name by cherry picking things told in confidence, much of which I now realize I was manipulated into discussing, on Facebook messenger. I have tried reporting the convo …

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