Sorry to be a party pooper on two accounts, but I don't think this angel guy is going to solve your problems either. One can already sense the tension between you and him, imagine what it's going to be like once he takes over the operation. And when he discovers that this 20K/month hole cannot be plugged, he'll be very pissed and you might suddenly find yourself fighting on more than one front just to make it through somehow.
I don't want to be just negative, but it's hard to give advice without knowing all the facts. In your place I'd probably look into these things:
Can the money drain be reduced to a fraction of what it is now? If that leads to a reduction in service quality, you need to ask yourself if the majority of the expense is actually going into the core offering that customers want from you? Can the scope of this thing be reduced somehow? What do customers actually need from you (concentrate on one core expectation if possible). Can you find money elsewhere, for example by making a business plan and presenting to a VC? Take a very critical look at your revenue expectations: are there any hard numbers you can work with and plan for? Can you partner up with a company in some form of mutually beneficial agreement, possibly reducing your expenses or at least to help you get in contact with a pre-existing customer base?