So you've agreed an open ended break? ok. It's something of a headfuck ride ahead. Also ok if you can cope with it - and i think that's what you've chosen for now, right?
Stuff happens and it does sound like this chap's had a plateful to deal with but you have posted so you're the focus.
I'd recommend you re-acquaint your self with experiences, hobbies, people you know beyond this relationship while you try and support this man emotionally. T see no reason why you shouldn't give this a go (for now) but it's essential that you also remind yourself that you are totally engaged in your own life. He is, it seems to me, part of your life for now. He should in no way be regarded as all of it. Nor should he be regarded as someone you can in any way lean on for anything. If you are a giving sort, which it seems you are, then this is a giving time. Until you decide it isn't. If the situation becomes one in which the giving drains or overwhelms you, demands more and more and more so that you lose the plot, then is a time to re-assess.
There must be inner t's and c's to your giving is what i'm saying. This relationship is probably going to be fairly one-sided for a while and it's up to you how long that's do-able. If it goes on too long you'll know because you'll be worn out, drama-ridden and dependent on its negativity.
If you need to know where you stand with anyone then you should look to yourself and your world for that confirmation.
Have you got it in you to support him almost as a friend would? Can you suspend your needs relationship-wise for a time? If not then re-assess your commitment now. Preferably without the "only man i ever loved" romanticism? nothing wrong with romance i might add but sometimes it needs to be tempered, fine tuned ...
An amount of detachment is required if you're going to try and support someone close through a hard time, especially on the basis of a potential future. Sometimes because of it.
"he said none of the problems with him Would've happened if he hadn't lost his job and had a long illness." Is this true in your opinion? How well do you really really know anyone after a few months?
9mths really isn't that long a time. Invest in yourself as much as this situation, if for no other reason than to keep a clear head to balance your heart.
My first post here after a year of lurking. Couldn't find how to do italics and just hope my comments are of some use OP