
It's sounds like it's going to be quite the grieving process, for you. The illusion of it all, the person you thought you married, who has turned out to be someone altogether different. Hopes, dreams, and now the entire shameful fear of his getting caught, with these activities, the exposure and how much harm it could bring to you and the children.
I'm glad you are taking the steps necessary, to pull yourself out, of the immediate path of danger. It's too bad, when they spin out of control. Glad to know, you've a therapist to work all this out with.
And PC, is fine to vent all you need, this is a shock to your system.