I, too, think you should attend your appointment alone. It's hard enough sometimes to divulge what's going on, let alone with an involved party present. Write things down that you want to remember to say. He doesn't really need to do that for you.
I know I struggled a lot with trying to be fully honest about things involving my ex. And he wasn't even there.
I'm with Christina in being very waffley when I'm doing very badly. Sometimes thinking we are fine is just lack of insight. Or trying to put a good face on it. Not necessarily the reality.
I'm glad you got out! Sounds nice.