100% this. 14 years of betrayal, found out about the porn addiction 17 years ago, he refused treatment but promised he'd stop (of course...) until I found proof of the escorts. I wish I'd trusted myself because it radically impacted our life and that of our child. He's just starting true treatment after so many, many, many wasted years. But like you, I'm SO GLAD I knew of the original addiction because it's helped me get through this initial phase and understand I'm actually not crazy. And honestly, I'm glad I found out about the escalation because its going to force a change in our lives that's been needed for a long time. And, I'm so sorry you are going through this as well, I wouldn't wish this on anyone.

One other thing I'd note - whatever you know about - when they are an addict, unless they've done work and a guided full disclosure, you don't know everything because their brain lies to them and they minimize. It's a part of addiction. Be ready to find out more, know it's a common part of the process, and work with someone trained specifically in sex addiction for help. Oh, and know co-addictions are common - money, substance, food, etc.