Please think and help me I have a question that keeps getting dodged.?

[Les R]

I'm getting a divorce. My income far outreaches my wife's because I am bleeding money from my IRA account to keep us going. I draw $69,000.00 from my savings each year, collect another $25,000.00 from disability each year. My wife draws $680.00 from social security, $700.00 from retirement from the county of Tuscaloosa as a bus driver and works part time as a manager of an apartment complex making another $1200.00 per month. Based on what I get each year I owe a lot more than she does but since we both benefit from what I owe I think we should share the cost of taxes on it. She says the hell with you, I will file married separately and pay about $1,500.00 and you can pay whatever else is left. Well, that amounts to about $16,000.00 filing separately. I have already held out over $9,000.00 and think she should have as much of a burden as me since I paid bills for us both and she didn't. How do I get fair treatment on the income tax? Over $69,000.00 of our income came from my IRA that I saved long before we were married. I can't believe that this system will make me pay another $7,000.00 on top of my already $9,000.00 and let her skate with only owing another $1,000.00 or so. This is the third time I have tried to get to the bottom of this question and the answerers I am getting are like, what did you say. Please, give me an ans-were or just pass me by?