Buying wise, we both are at the end of our savings, no one can afford to buy the other. And there currently doesn't seem to be any funds raising in sight.
Offer him some shares or options in the future company but tell him this isn't working out. He'll say he already owns "half" but the truth is if you walk away he likely doesn't have a damn thing.
Offer him some equity to walk away or tell him you're quitting.
I would talk to your partner and say "let's come up with a timeline where you hit these goals or we look for a third-party person to buy you out". If he can hit those goals, or hit those goals with the help of a commission only salesperson then your problem is solved. If not you start looking for a third-party.
If that's truly the case, then you're done as business partners.