You don't explain how you and the co-founder decided on the pivot. It appears the pivot wasn't your idea. And at least one investor isn't supporting the pivot e

You don't explain how you and the co-founder decided on the pivot. It appears the pivot wasn't your idea. And at least one investor isn't supporting the pivot either. Reading between the lines: your co-founder is reliant upon you and your network and skills to raise funds. But if the pivot was at his urging, then the only honorable thing to do is what you propose in the last paragraph.