O.k. I’m Having Relationship Issues?

So over the past few months my boyfriend and I have been arguing a lot. Mainly it’s b/c we’re talking about buying a house together (no comments on you should wait to get married..it’s an investment and he’s a partner) and trying to get our credit scores up by paying off some small stuff on our reports and try to pay down CC etc…basically just get our finance in order. Our fights mainly center around small stuff like cleaning the house and stuff like that.
But about 2 days ago he received a letter in the mail in regards to some Medical CC that was no interest for 12 months. Well, he went beyond the 12 months and now has to pay back interest. The thing is, i told him about this a year ago. He’s always lecturing me on my spending habits..but i have an excel spread..i run my finances/house like a business..i have income, expenses NOI per month…and the excel spreadsheet matches my bank acct to the dollar. NEway, he’s all pissed off now b/c he paid only half of the bill in a years time and now with the back interest it calcuates out to he’s only really paid like $20. so he’s back to where he was a year ago. He’s pissed. I mentioned that he should have listened to me a year ago when I tried tell him he needs to pay no less than $100 a month (more would optional) to make sure you don’t accrue the interest at the end of the year. Of course, he starts an aguement, even then, claiming I don’t konw what I’m talking about.
So today we got into a major agruement b/c i went to Chipotle for lunch..he starts to lecture me about how i need to save (i make slightly more than him) for a house blah blah blah. It just really pissed me off b/c i’m totally in control of my finances..i have even suggested that i give him the excel spread i use..it’s simple to use and it would help him. But he refuses. So then the fact that he works at a dead end job came into play and he gets all huffy. It’s like, i’m bust my butt at work..i do commerical real estate..its really slow right now, but i have been searching for other options myself lately. Like maybe working full time and go back to get my masters…i have asked him today if he doesn’t have enough money to pay his bills has he thought of pursuing other options. He always blames it on something..right now it’s ecnonomy before it was “i like my job..it’s low stress”. I feel that he’s not trying.
So my question is….can some married or long-term relationship ppl offer some advice on how i can get him to listen. He acts like i don’t know what i’m talking about half the time….but i’m more business savy than him. I read contracts etc etc. He doesn’t even want to reliquinsh the ropes to me either. I have suggested even doing his bills for him. He’s horrible with money management. I have talked about marriage, but seriously, i can’t marry him if he’s not gonna reliniquish the finance management robes to me. He’s has proved to me he cannot management his money “our” money in the future. Any suggestion please on how to approach this situation so it will make sense to him and will concede. I almost have to make it like it was his idea. Men are soooo prideful and odd sometimes.