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I am sorry but IL does not recognize common law marriages unless they were entered into in a state that does allow them. You must have a marriage license.
The only thing I can suggest is if you had a verbal agreement that he would support you, you could sue for breach of contract. If you had children together, you could file for child support. Otherwise, the law does not offer rights to individuals who remain unmarried.
Please let me know if you need additional information.
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