Please help! My man sleeps with married women

Please help! My man sleeps with married women

Thank you for this opportunity given. May God bless you.
There is this guy I just broke up with because I found out that hes a chronic cheat. He sleeps with both married and single women. He has been dating this pastor lady who is married to a pastor of a big church in my state. He has been telling this woman that he doesn’t have any girlfriend. He has been lying to the woman so he can be collecting more money from her. Even when the woman asked him on phone if he has a girlfriend, he keeps telling her that he doesn’t. I 1 day asked him to introduce me to the woman as his girlfriend since he said shes his god mother. He made a statement ‘which girlfriend’ that was when I realised that hes sleeping with her.
Should I walk up and tell the woman that we have been dating or tell her husband about who the wife has been sleeping with.I have chats of where the guy asked the woman to get pregnant for him and give her husband the child. Should i forget telling her and allow karma deal with them? The man is well known man because of his church.What should I do. What if she 1 day gives the man hiv. Seriously I wanted a revenge. Thank you