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Yes, it sounds like he may be able to claim you based on the information you provided. Here is a little more information to help you decide if your situation meets all the criteria:

If all of the following apply then yes, your boyfriend could claim you as a dependent on his return.  The rules for claiming a non-relative as your dependent are as follows:

  1. Cannot be claimed as a dependent if you are eligible to be claimed as a dependent on another tax return. Whether you are being claimed is irrelevant, it’s the eligibility that matters. 
  2.  Must be a U.S. citizen, resident alien, national, or a resident of Canada or Mexico
  3.  Not a “qualifying child” of a taxpayer. 
  4. Earned less than $4,050 in taxable income (social security doesn't count) in 2017
  5. Did not provide her own support. You must provide more than half of the total support for the year
  6. Lived with you all year as a member of your household

 Claiming GF as a dependent

 The easiest way to determine if he can claim you as a dependent is to enter you into TurboTax as a dependent and answer the questions and TurboTax will determine if he can claim you. 

He can go back and Amend Your Return to claim you on his past returns.  "Generally, you must file Form 1040X within three years from the date you filed your original tax return or within two years of the date you paid the tax, whichever is later."https://www.irs.gov/newsroom/ten-facts-on-filing-an-amended-tax-return

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