I fell in love. Was a real mess. Heading out of an awful marriage, together while we sold the house. He assured me once I'd got my own place he'd leave too. He didn't. He mentally and emotionally abused me to the extent I knew he was doing the same to his wife. She knew about me. We met and talked and she said I was welcome to him, he still didn't leave.
I ended it. He came back 6 months later and begged me again, I'd broke his heart etc. told me marriage over. Still didn't leave.
3 years later it's just ended again as he still didn't leave and was lying as much to us both as he always did.
She saw us together and laid into him big style, she said she recognised I had a part to play but that I'd tried to walk away and wasn't strong enough when pursued by him - narcissistic men are like crack cocaine until you break the addiction. She blamed him completely as he was the married one.
But she's still living that life and finally I'm so relieved I'm no longer part of that circus.
I did care about his wife - much as most won't believe it. I asked him repeatedly how she was, had he told her etc etc. he lied and lied I now know. I apologised to her when I ended it last year and I meant it. But as I said, I was weak and addicted to that vile man. He's broken me, I'm doing a lot of work on myself still.
I will never ever cheat or be part of cheating ever again in my life. Fortunately my ex husband has been happily with another woman for a long time now but will never forgive me, nor will my (grown up) children. I've paid a big price for my foolishness.