I completely agree with Shezbut. It's too easy in this country to leave one marriage and jump into another relationship. We don't take our vows very seriously. Vows are PROMISES and are meant to be kept, unless of course there is abuse in the marriage.
Like Shezbut said, you two need to communicate regarding your financial woes. It seems like you aren't talking at all. These resentments are just growing and growing, and soon there won't be any resolution to it all. Again as Shezbut suggestion, perhaps marriage counseling would be best -- you both must get on the same page, especially as spending and finances are concerned, plus learning to communicate is a must.
I wish you the very best. Let us know how things turn out, will you? God bless and take care. Hugs, Lee