The design as it is now does not matter that it's all yours. You've gone through several iterations and the mock-up was his. The initial idea was his. You are a resource. A valuable resource but a resource nonetheless. The 60/40 tells me he thinks it is all his baby and that he can replace you. You confirm that thought. He doesn't want your code and will start from scratch which tells me he really doesn't like how things have developed.
Now, you say it could launch in a week? Is it a NDA or a non-compete that he wants you to sign? NDA means nothing at this point. You built it. Non-compete would mean everything as you could take the code and launch your own project if you believe in it.
You haven't been paid, haven't any signed agreements, and have done all the coding. Legally, without any documentation, it sounds like your partner would have a tougher time to prove ownership. What's in your emails?
So ultimately you got this:
Partnership is dissolved.
Nothing is signed.
Talk to a lawyer to straighten this out. Likely a mediation to determine ownership is required.
And learn your lesson for the future: Get it in writing.
The design as it is now does not matter that it's all yours. You've gone through several iterations and the mock-up was his. The initial idea was his. You are a resource. A valuable resource but a resource nonetheless. The 60/40 tells me he thinks it is all his baby and that he can replace you. You confirm that thought. He doesn't want your code and will start from scratch which tells me he really doesn't like how things have developed.
Now, you say it could launch in a week? Is it a NDA or a non-compete that he wants you to sign? NDA means nothing at this point. You built it. Non-compete would mean everything as you could take the code and launch your own project if you believe in it.
You haven't been paid, haven't any signed agreements, and have done all the coding. Legally, without any documentation, it sounds like your partner would have a tougher time to prove ownership. What's in your emails?
So ultimately you got this: Partnership is dissolved. Nothing is signed.
Talk to a lawyer to straighten this out. Likely a mediation to determine ownership is required.
And learn your lesson for the future: Get it in writing.