You are never required to file jointly even if you are married. You may file as married filing separately. If you agree to file jointly, then you are jointly an equally responsible for all the statements on that tax return, including any errors, omissions, or fraud.
If you want to file separately this year and not to give your information to your spouse, that is your absolute right to do so. If you want to re-file separate returns for previous years and claim that you filed jointly under duress, you might be able to do that but you would need the help of an experienced tax preparer such as an enrolled agent.
Most of all, you need legal advice on your situation. Your spouse’s business income should never be reported under your Social Security number if your spouse is the one performing the business activities, and you may have other legal issues that you will need help with.
