First of all, apologies mumsnet for posting on your site - I am not a mum, but there is a lot of wisdom from women on here, so I am hoping to get an answer.
While on a recent group expedition to a beautiful, rugged country (one week, 10 people) I had an affair with the organiser. He was lots of fun, plus conscientious, decisive and caring. Just great company.
He never mentioned that he had a girlfriend, and only told me so after we'd first kissed. He said it was "complicated" and he'd tried to break up for over a year now and had cheated on her once before "when I realised it was over a year ago". But since they have been living together for 10 years, it was hard. Crucial was the fact that he didn't see a future for their relationship, as he wants marriage and kids and she doesn't.
So, we had unprotected sex a few times, also back home after the trip.
However, he has since turned from "conscientious great-guy" to "cheating chicken", and seems to have no intentions anymore of leaving her.
I feel completely taken advantage of now. I am not "the other woman". He was quite dominant in bed, and I only agreed to that because of who he was and what he said. He was completely open with me in front of everyone on the trip, so much so that people were surprised to hear back home that he is still with his girlfriend.
We never said that we would get together once he breaks up, but I am hugely upset now and have been off work with a bout of depression (in fairness, I am clinically depressed, but this was an unnecessary low).
So, what to do? I feel she should know, not least as we had unprotected sex. I would also, possibly, provide some closure for me.
But is this really vindictive and spiteful?
I genuinely don't know what to do. I had given up on men for a good five years, because I have a phenomenal talent for pulling the wrong ones. Now, knocking on 40, I thought I could give it another go. And, sure thing, another bad one.
Thank you to anyone and everyone for advice.