For this reason a man shall leave his father and his mother, and be joined to his wife; and they shall become one flesh (Genesis 2:24). So they are no longer two, but one flesh. What therefore God has joined together, let no man separate (Matthew 19:6).
Money is one of the major causes of friction in a marriage, and it's no wonder. Living in a world in which we are constantly worried about taking care of ourselves, it's easy to forget that marriage is a commitment to forge a new life with another person. The lack of trust emerging from society has created prenuptial agreements and separate bank accounts. These undermine the commitment to a shared life with a spouse and are contrary to biblical teachings.
Whenever financial issues begin to get out of hand in a marriage, the first thing to do is to pray about them. There is no substitute for God's answer. Second, you might try using a marriage counselor who is trained to help couples resolve issues diplomatically.
Ours, Not Mine
A husband's and wife's incomes in marriage should be merged and shared. Someone should be in charge of keeping a budget for the household, and whatever funds there are should be held mutually. This will require a lot of faith in the Lord, as well as in your spouse.
Don't forget to ask God what He wants you to do with your money. He made you stewards over your finances for a purpose, so you should always remember to ask what His plans are. Many blessings can come from appropriate money management in marriage.