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I am not an attorney but alimony is a function of a divorce or separation agreement. That agreement should spell out what payments made to a former spouse are to be considered alimony.
Here is a link to IRS Publication 504 that deals with Divorced or Separated Individuals
Beginning on page 11 you will see what is considered to be alimony and what is not.
Just because your former spouse claimed payments to you as alimony does not make it so.
Review your separation decree to see if the items he has characterized as "alimony" fall under the items in the decree.
You only need to claim payments made to you defined as alimony in your separation agreement not what someone else deems is alimony.
You may have to see your attorney for clarification.
If I can be of further assistance with this issue, please contact me.
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