If you filed a joint return then you can (since a spouse could not have been claimed as a dependent) :
1) ask him for a copy of the return and/or the AGI
2) get a copy from the IRS
Go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript
For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf
