In a recent interview, Ruth Wilson says she left The Affair because there were things she "didn't feel safe about."
“The reason I haven’t gone into The Affair is that I haven’t worked out how to discuss it," she said. "There’s a lot of noise and anger surrounding it, and really the power rests with me to choose how I discuss my life and my experiences.”
She added, “What’s important to say is that I did speak up. I did have a voice. I did stand up for myself...there was a situation on The Affair where things didn’t feel right, and I dealt with them, and I managed to protect myself. It was before #MeToo and before Harvey Weinstein — and yet my instincts were very clear and strong about what I felt was wrong, about what was going on, and what I didn’t feel safe about..."
Ruth has previously described the environment of the series as toxic. She left the show in 2018, with costar Joshua Jackson following her out (showrunner Sarah Treem unfollowed Jackson on social media soon after). The show ended in 2019.