[Maro]

Based on what you write it's over because you're burnt out and no longer believe it will work out. It will be a tough conversation with your co-founder, because he's in a different situation. My advice: don't make it a discussion, tell him what the situation is. At this point, letting him talk you into continuing (eg. he gives you money) is a bad idea.

My story: I did my 1st startup for almost 4 years. No pay for first 2 years, supported ourselves from other income. Then the startup "took off" in a small way, and we could pay ourself a minimal salary (=about 1/8 of what I now get as an employee of a successful startup, not my own). The last year of the startup, when it was basically failing, was really stressful. I once went 7 days without sleeping, depression, wife left me, got divorced, worst episode of my life. Lesson learned, as they say in the startup world: fail early :) In my case, I could already tell there are problems before the last year, and that's when we should have quit. Next time I'll be wiser. Btw. it's 3 years later and it's all good now, so heads up! Go out and run a marathon.