I'm all for pragmatism and cooperation, but it sounded like the OP already tried that and the current state is the result. Yes, start with what you're suggestin

I'm all for pragmatism and cooperation, but it sounded like the OP already tried that and the current state is the result. Yes, start with what you're suggesting but don't just accept getting used. Who's at fault matters here, if the cofounder is truly acting in the way suggested and is not willing to compromise then it's critical to get the other investor to see what they're doing. If that leads to the cofounder blowing up and the death of the company happening sooner rather than later so be it. If it turns out OP is actually not contributing anything then yeah, better to seek some sort of clean exit compromise. The details matter and how much leverage OP has matters. It's impossible to give good advice without knowing that in either direction. At a minimum the OP should get the one year cliff on exit.