I think your title isn't correct. You said as much yourself - you don't hate the startup, you hate the people, and your analysis is correct, it's the break-up t

I think your title isn't correct. You said as much yourself - you don't hate the startup, you hate the people, and your analysis is correct, it's the break-up that's tainting things. Are you the boss? Can the thing run without you for a while? Take a break. Make a decision: stay or go. Come back and implement it.