[abootstrapper]

You need to leave. I had a similar predicament before, and selling out was the best thing I could have done.

Confide in your business partner, and discuss with them the most graceful way for you to exit.

You're not doing anyone a service by staying. It's bad for you, and for the business.

For your next venture, consider your goal of maximizing your free-time, and focus on endeavors that will give you that. Personally I know I'll never be a Steve Jobs, but I can have a beer at 2pm! :)