You will leave when you are ready, and not one second before. Same with all of us.
If you are hanging on so that you can get your money back, I would echo loner's warning. And also point out that if he loses his job, THEN has a major medical episode, being married to him will put you in debt far more than thirty large. Staying is no guarantee that you are going to be better off financially. For me, leaving was the key to financial stability, even though he owed me thousands. I'm now ten times better off than he will ever be...never would've happened if I hadn't turned my back on a vague possibility of repayment.
If you're hanging on for another reason, well, see "you'll leave when you're ready" above. I wish you peace, teree