I don't know if this is who you were talking about, but this guy was a big FIRE proponent/blogger who posted last year about his divorce after not updating his blog for several years: https://livingafi.com. It took a few years of early retirement and his coming down with a medical condition, though: "During this time of physical rehabilitation, while I was struggling with the physical issues, my partner finally figured out what would make her happier. It was a relationship with another man."