I'm making some assumptions here but I'm guessing you meant "Customers" not "Costumers" and also you have been putting in a bunch of work for the past two years on your project with little to no income from it or any other source.
Unless this IP or "Code" was written by someone else let it die on the vine with the rest of the company, write new code for your own project, use your experience to make improvements to the new code and start fresh, it sounds like you were using pieces of gpl code anyways.
Why would you bother taking the risk of creating a unicorn only to have your pokects picked by your "cofounder" that quit, then sues once it becomes profitable?
No matter what agreement you made, even if you get it notarized, your risking much more than if you just knuckle down and do the work again yourself.
Besides it's always easier and faster to do it a second time.
Unless this IP or "Code" was written by someone else let it die on the vine with the rest of the company, write new code for your own project, use your experience to make improvements to the new code and start fresh, it sounds like you were using pieces of gpl code anyways.
Why would you bother taking the risk of creating a unicorn only to have your pokects picked by your "cofounder" that quit, then sues once it becomes profitable?
No matter what agreement you made, even if you get it notarized, your risking much more than if you just knuckle down and do the work again yourself.
Besides it's always easier and faster to do it a second time.