You don't say how long you've been together, so it's difficult to answer this question. However, I wonder why you loaned him money to help him get out of debt in the first place. His debt is not your responsibility, it's his, and whenever you loan a sizable amount of money to people who are close to you there's a high probability for a mess to be the result. The fact that you actually gave him money from a loan that you took out really perplexes me, because whether he pays you back or not, you are still responsible for this money. Another thing to bear in mind is that he didn't "let you do" anything. You are an adult and you CHOSE to do this, and as a result, you need to take responsibility for that choice. Unless he put a gun to your head, you made this decision to give him this money, and the consequence is yours alone to bear.

Is his debt your business? Well, is your debt his business? Are you in a committed relationship leading to marriage, or are you just dating each other? Just because you loaned him money does not make him obligated to disclose his financial situation to you, as much as you would like to know these details, though if you're in a committed relationship, his secrecy and dishonesty would be troubling to me. However, that said, I do think you are entitled to set up some sort of time table for him to pay you back if you haven't done so already. I'm curious as to how you found out that he owes more than he said he did. It could be that he is embarrassed about you finding this out and that his reaction is a reflection of this. Or maybe he doesn't like how you went about finding out. Without more information, it's hard to say.

However, based on his reaction to you, I don't think his finances are your only concern to have here. Does he always storm off like a child and shout when things don't go his way? It doesn't seem like a mature way to handle issues within a relationship, and in your shoes I'd be upset, too, because that reaction is going to remain the same regardless of the issue. If he can't have a discussion as to why he doesn't think this is your concern and listen to your reasons why you think it is, and if he can only have a tantrum about it, then do you really want to put up with this kind of behavior? Better still, do you believe you deserve to be treated this way? If, however, you've already had this discussion and he's given you his answer, then all the nagging in the world will not change it and will only exacerbate the situation. His reaction is only going to get worse because you will not accept his answer, whether you believe it is right or not.

I wish you the best of luck with this situation...it certainly isn't an easy thing to deal with....