Colorado is one of the few states that still recognizes common-law marriages. “A common-law marriage is established by the mutual consent or agreement of the parties to be husband and wife, followed by a mutual and open assumption of a marital relationship.” People v. Lucero, 747 P.2d 660, 663 (Colo. 1987). If you cohabitate (for any duration) and you both mutually and consistently hold yourselves out as “married” and have a reputation as being married, then you have a common…