1 Look, I totally get your anger and if I was being cheated on I would want to know. But it sounds like you’re coming at this more for revenge than the well-being and safety of the other woman. She needs to know but I would definitely take some time to calm down and say it in a curt and tactful way.

2 I understand your frustration with her, but don’t you find it a little strange as her ex-boyfriend to be reaching out to her new boyfriend? Just let them be miserable together and take it as a blessing not a burden.