Tell me how your finances are set up. She works, yes? Do both your paychecks go into the same account, and you pay for things out of that? I'm not asking how much you or she makes... but who pays for what, and where stuff goes. Do you have joint credit cards, or do you each have your own, and pay your own?
Is she responsible with her saving/spending, or does she pretty much do what she wants, when she wants? Who foots the bill for that?
How is the division of labor in your house set up?
Please answer. It will help very much to know this.