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I am sorry to hear about this situation.
Simply living together does not allow one any extra rights from him. However, you can claim a common law marriage and seek a DIVORCE. A common-law marriage in Colorado is valid for all purposes, the same as a ceremonial marriage. Only death or divorce can terminate it. The common-law elements of a valid marriage are that the couples (1) are free to contract a valid ceremonial marriage, i.e., they are not already married to someone else; (2) hold themselves out as husband and wife; (3) consent to the marriage; (4) live together; and (5) have the reputation in the community as being married.
If the Court agrees that there was a common law marriage, it can then officially divide assets obtained during the marriage period and even can order ALIMONY. However, for this to happen, you would have to file a formal complaint for divorce in the Court. If you do not, then it is presumed that no common law marriage happened.
Let me know if you wish to know more about splitting of assets and alimony.
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