@HelloStereo It’s not exactly the same thing, but I have been in a situation where I believed myself to be seeing a man who later turned out to be married and having an affair with me. I had piles upon piles of evidence from over 12 months of his cheating, which I could have sent to his wife and that couldn’t have possibly been disputed (photos, text messages etc.) and to this day, nearly a year after I found out about his wife, I still think about contacting her and telling her everything.
In the end, I decided not to do it. Not to protect him because he’s a c*nt who deserves everything he gets, but because I didn’t want to bring more drama from the fallout of telling her down on myself. Although it affected me badly for a long time, I decided that completely cutting him off, drawing a line under it and moving on with my life was the right thing to do for me.
I suppose what I’m going round the houses to say is, if you do decide to tell her, it’s not going to be as simple as dropping the bomb and that’s that. It’s someone’s life you’ll be blowing apart and there will be fallout. It’s up to you to weigh up if you want to continue dealing with this for the foreseeable, or if you do want to just draw a line and chalk it up to a lesson learned. He will get caught out eventually, liars always do, but personally I think you’ve had enough of your time and energy wasted now.