What happens if I stop coming to classes?

You are held accountable to come to classes when you have one private a week. The Reason why is if you don’t come to open classes it will slow down your progress, and there will be no use for a private session after that to fine tune what you supposedly should have been working on independently in the open class. The privates will start being a waste of time; you and the instructor will have no goal to work towards and no new exercises to explore that your body will be ready for.
No open classes, no privates. No privates, no open classes. They both depend on each other!