John Stamos recently opened up about his marriage with ex-wife Rebecca Romijn, and why it was a “difficult” journey for him.

As John Stamos admitted to People in an exclusive interview, writing his memoir If You Would Have Told Me was challenging for him because he had to describe his failed marriage in detail.

My first marriage was shattering for me. I was shattered for a long time, too. I viewed her back then as the Devil, and I hated her.” John said.

According to the alum, “I couldn’t believe how much I hated her, and it ruined my life. Looking back, I talked about it in the book where the fourth step is to lay out all your grievances, everything people have done to you. I said ‘None.'”

Moreover, the 60-year-old believed the X-Men actress dumped him because she was thriving in her career and he wasn’t.

I find that humiliating. It’s not her fault. It was just a perception people took, and maybe they weren’t wrong,” he concluded.

The couple was married for almost six years before deciding to part ways in 2004.