It sounds like the core problem is that you're unhappy about how the division of roles was made. Is it that your co-founder isn't contributing as much as you to

It sounds like the core problem is that you're unhappy about how the division of roles was made. Is it that your co-founder isn't contributing as much as you to the company or that he doesn't respect your and others contributions? or both? You say each of you was responsible for one side of the business, did you agree on this split together or did it just happen? when was it apparent that you weren't happy with how the roles were split? If you could go back in time, would you rather both of you contributed on technical work? Do you feel it's unnecessary to have your co-founder dedicated to sales? Are the main problems the company is facing technical, sales or something else?