I'm another person who thinks 'win' is a really bad description - I think when there's an affair there are no winners, just shock and pain. Saying that yes, sometimes OW 'wins' sometimes not.
My dearest friend had a habit of only dating 'unavailable' men ( I always struggled with it as was married myself ). One was undergoing fertility/ IVF treatment with his wife. My friend got pregnant. She finished the 'relationship' immediately . The MM was desperate to leave his wife for her- she said no way.
She has now been together with her current partner for nearly 15 yrs and they are very happy. He left his wife to be with her, they both have children and all of them live blended with her and him . All very happy.
For myself, she was a huge help when my dh had his affair. She could give me the perspective of an OW. I think she was hugely shocked, witnessing the carnage of how a betrayed wife felt though.
In my case the OW did intend to win. The affair had been going on for a while. I was totally ignorant of it. Our marriage was awful as I was 'coping- not really' with a huge trauma that was unrelated and totally wrapped up in that.
On Revelation day , they both took the day off work to make plans; OW had booked the week off for my dh to move in. She was hugely attractive, over a decade younger than me and a trust fund baby . If you viewed it as a 'competition ' she was confident enough that when she told my dh she would not be his mistress and he had to tell me and leave me . That's what would happen.
He did tell me that night, I told him if he wanted to go - then go. The door was open, I wasn't prepared to 'fight' for him in a competition I had been unaware that been going on. I also told him that when I married him he had standards and morals better than someone who would cheat on their partner, if his standards had slipped to those levels that found it acceptable and his OW found that attractive - they deserved each other. And he was no longer the man I thought he was.
I also told him that whatever she had, however she looked and behaved I was just happy to know I had better morals than her.
For us, that was nearly 2 years ago. We are still together. Who won? Nobody.
OW lost a job she loved,a man she loved and a whole future ahead that looked rosy.
Me, I have grown , I'm more confident and happier than for years but will always know Dh had an affair, that innocence has flown.
Him, lives with the guilt of the pain he caused everyday. The ' work ' he has put in is huge - but he can never turn the clock back and change what he did....
No winners, just survivors.