You can request a free transcript of your 2019 tax return to get your AGI. Please see How do I find last year’s AGI? for more information.
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If you were still married in 2019 your spouse could not claim you as a dependent. A spouse is never a dependent. Did your ex file a Joint return for 2019? You need to get a copy of the 2019 return. If it was a Joint return they have to give you a copy. You might have to ask your lawyer to get it from her if you can't get a copy from the IRS.