Hi Wintersnow. I haven't RTFT but thought I would tell you my story.
I was an OW over a decade ago.
When I met her him he told me he was single and I believed him. He lived about two hours away and worked interstate, so it was easy for him to get away with the lie in the short term, but he did tell me the truth after a month, and I was gutted.
He told me he was in a loveless marriage and that he was only staying for the children, that his DW was a cold woman who had lost interest in him years ago and had turned their kids against him. He said they hadn't had sex for years (of course).
As we became more involved he told me he'd seen a divorce lawyer, who, conveniently, had advised him to stay in his marital home.
I could see that it was going nowhere so I took a job in another state and moved far away, although we were still in contact after I left.
I never saw him again but I did hear from his DW, who'd got into his mobile phone and found my number.
She yelled at me and called me names, understandably, then hung up. But she rang back and yelled some more. I wanted to talk to her though. I wanted to know the truth.
I learned that he'd been lying to both of us and that there was another OW involved. When she asked me what he'd said about his marriage and I told her, she was utterly devastated.
There were more conversations between us and it turned out that he had been a serial cheat throughout their marriage and she even suspected he'd slept with her own sister. She suspected he had an OW in every town he worked in and confided in me about the other OW she did know about.
She loved him and had been with him since they were youngsters. They had kids. I ended up liking her and feeling very sorry indeed that I'd caused so much devastation.
Before she contacted me, I hadn't thought about her. The ex-MM had painted a picture of her as cold and difficult that made it easy for me to ignore her existence. She wasn't someone I thought about, not because I didn't like her but because she wasn't real to me.
I justified it because I thought I was in love.
What made me do it? At first because I thought he was single. What made me continue after I knew otherwise, I guess, was infatuation, selfishness and naivety.
As for your question, how can you live with yourself knowing what it does to the other person?....
I couldn't now, knowing what I know, but I could then, before speaking to the DW, because I didn't have the full picture about the reality of their marriage or her as a person.
He'd told me a pack of lies - they did have sex still, he did love her - and still does - they are still together. Looking back, I was just a bit on the side but couldn't see it.
Whenever I hear now of a friend or a friend of a friend (I know of two active affairs), the OW always says: "Oh, but he says X and Y....." My answer is: "That's what he says. Have you heard his wife's side of the story?" and of course, they have not.
I've never dated an attached man since. I think that's because the DW rang me and told me the truth.
I'm not advising that you do the same, WinterSnow, because the OW in your scenario may not want to co-operate. But if he's cheated on you with her, he'll do the same to her.
I'm sorry you are going through this.