This is the partnership that never was. I'm assuming he put in no cash and what he was bringing to the table was his work product. If that's the case...I don't see where there's a partnership. When he failed to deliver on his portion of the contract he breached it which invalidates the entire thing.

If he were me...I wouldn't accept the work product now or in the future and would send him a certified letter stating your intent to end the partnership based on the fact he breached the contract by not delivering in a timely manner.

Now the caveat...spend a hundred bucks and verify my info by TALKING TO AND ATTORNEY.
Good luck
Denny