There was a similar situation here only earlier this month. www.mumsnet.com/Talk/relationships/3386922-Should-I-tell-this-lady?msgid=81655479 The overwhelming consensus is that you should tell the other woman/women. I will repeat what I said over there:
SalemBlackCat4 Sun 07-Oct-18 07:24:18
I disagree with those who think ignore. As a woman, I think you have a duty to tell a fellow sisterhood if she is being cheated on, especially if serially. Do people not understand that this woman's life could be at risk, if not from HPV or similar, but from HIV? I think it is very selfish and callous of people to walk away and not tell someone. I would want to know. And if my partner had been cheating on me for years and potentially risking my life and my health, I would want to know. If I got sick, I would be just as furious, if not more so, at those who knew and turned their back on me and walked away. If you can do it anonymously via screenshot evidence, then do it that way.
Add message | Report | Message poster SalemBlackCat4 Sun 07-Oct-18 07:26:28
"If ‘telling’ was the ‘default’ we would make it far harder for these twats to cheat "
EXACTLY!!! This happens because us women enable it and turn our backs on our own sisterhood. The repercussions of this is not just healthwise for the woman possibly infected, but it enables men to get away with this.
Not telling is unconscionable. It is a bigger betrayal than the act itself.
@JudgeandJury, you really need to tell her and the others, at the very least her. Apart from the loyalty to sisterhood angle, and apart from the health angle, you are now known as a STALKER by his friends. NO FUCKING WAY, NO FUCKING WAY would I not shut that woman down and clear my name. I don't care what I would have to do. This is no way she would not have been set very straight about the TRUTH. Because I* will not allow anyone to give me that label if I don't deserve it.