They're not enjoying working on the company together. It's mainly that they don't like or want the stress of working on a startup, and want to run it more as a lifestyle business.
You probably can't work together anymore now, but you both seem to think the business can be profitable, so if you decide to leave you should be compensated for what you built.
Don't rush the decision. You've worked for 11 months, you can take 2 weeks to talk about it and think things over.