I think you need to have a conversation with him about it. Say outright that you are accepting this money as a friend and only because you are in really rough times, and that this does not mean in any way shape or form that the relationship will become romantic, or different in any way. Possibly you can even get this in writing if you're super worried, that would be aquard but that way there's no strings...

it sounds like you could really use the money and if this guy is honest and fair about it, would be wonderful. Try to be true to yourself about this and your feelings. And to him as well.