This might sound a bit unfair but.. Either stay on-board, keep on fighting (and investing time/money) and make your mission a success together.. or leave it to

This might sound a bit unfair but.. Either stay on-board, keep on fighting (and investing time/money) and make your mission a success together.. or leave it to your co-founder to do so! If you walk away now - considering the broken state of your company, the debt and all that - you basically give up all your rights. Especially when somebody else turns that ship around after you're gone. Your co-founder will most likely end up with sleepless nights, 16+ hour days , pitching the idea to potential customers/partners/investors/buyers, worrying about financials and whatnot to get shit fixed.. while you, well, walked away starting something new or going a vacation as some already suggested. There's nothing wrong with that, but don't expect people to invite you for cake after you did. You can sell your shares to your co-founder for the initial value, or just give it to her for all the money she invested/lost. Your idea/work so far is worth nothing when you or the company can't monetize it right now.. See it as a very loooong marathon that you quit after a few miles of sprinting. Executing an idea means executing it to the very end where it became successful. And in case you two decide to leave that ship together, share your earnings (debt) together.. Same as if you decide to turn things around together :) Good luck with whatever you decide to do, as long as you play fair!