Because he's employee #1. I bet he's thinking there's some great way to come out on top, like "Tell them that you now require 40% equity to continue, 55% of voting rights, immediate cliff, and that if this is more than they can do you must now pursue other options". Well, sorry, there's nothing like that that you can do and 'come out on top.' Just cut your losses. :(
~ No users ~ No revenue ~ No investment ~ No developer founders
Sounds like you know what to do, but you're still in a state of denial.