RE: "Hes's really angry/frustrated at all of this because he 'just wants to get away' and our finances don't allow that right now. I want to support him and respect his need for space, but how can I do that while we live in the same house?"
Its not your problem. It is your house too. If he wants to get away, that is up to him to do. If he really wanted it that bad, he'd do it.
I agree with Some Day... don't believe the dating promises. You need to believe what he does... not says. Same for you. If you want him to believe in your changes... show him.
When you are happy as an individual, you are in a better position to determine whether a partner enhances your happy life or weighs it down.