Yeah, you can take away everything you've learnt from it (which in itself is a valuable thing) but you're unlikely to get the business in a form that's worth the trouble.
It's amazing how as humans we cling to the slightest thread of hope.
It's amazing how as humans we cling to the slightest thread of hope.
Wish your co-founder the very best of luck, sign everything over to her, and walk away. Hope she does amazingly well and can fund your 4th or 5th startup because you're still friends.