From what you know and have heard , there really is no proof of anything . They were known to be in a relationship and at some point he may have learned of it . Regardless of the truth , the burden of proof for this type of allegation is very high , and I don ' t think there would be adequate evidence . Most likely outcome is that you will make an enemy of a physician and any of his colleagues he complains to about you . No discipline will come to him and Anna will be angry . You are being blinded by the desire for petty revenge or interference with your friend ' s crappy relationship choices . Don ' t get involved . You could end up with a very real vendetta against you that could ultimately harm your career and license . I have seen it happen .