I found something out about someone that I thought was a throughly charming, life sorted, wife to be pregnant a few years younger than him, well he has been having a relationship with someone else.
The OW has stepped away but not before saying he needs to work out who he wants.
Does his partner need to know that he has been sleeping with someone behind her back, just to get herself tested for her and her unborn babies health.
AIBU telling her or just keep what I know to myself.