I think this has more to do with Georgia Law than Colorado Law. I have dealt with this problem with a California case before and it is pretty difficult for another state to determine what is or isn't a marriage in Colorado, but that is essentially what you wind up asking them to do. Colorado allows for marriage at common law. All it really takes is for a couple to live together and represent themselves to the public as being married, but you would probably need an expert (lawyer) on Colorado law to testify in a Georgia court about that standard in order to win that argument there in Georgia. Georgia (like California) may also have some rules regarding what happens when someone either gets married or starts to live with another man (unmarried). In California (in my case) both arguments were made and the latter argument held, because the judge did not want to make a finding as to the common law marriage standards that Colorado has set.
Good luck and I hope this helps!
Culver