My best friend has been an OW for two years.
She had a minor crush on that guy, who found out and seduced her.
He said many many times that he didn't love his partner, that they were together just for the baby's sake.
Each time she wanted to leave him because she was tired of waiting, he'd manipulate her again and again, she was madly in love with him, she was making plans to live with him, even considering buying a place which would be suitable for the baby.
They were hardly secret, they had the same group of friends and everybody knew they were together.
One night, she texted me, said she needed a drink, met her in a bar, and she was devastated, crying like I've never seen someone cry, the partner had found out, confronted her, and they both confronted him. Turned out they were actually TTC for another baby at the time and were very much lovers, not flatmates as he said.
Just imagine how her life has been turned around within an evening. The day before, she had grand plans, she was in love and felt loved as well, the next day, she was crying in my arms, knowing that she'd never see him again.
She never manipulated him. She was manipulated big time.
She's a good person whose mistake was to not foresee what she would get into.
He's a dirty scumbag.
So easy to put the blame on women.