Unfortunately, companies have these types of policies more and more frequently and they are not illegal to have. They can have rules stating married couples cannot both work for the company and they can have an anti fraternization policy, even though they may have allowed it for employees who were involved before they enacted this rule (as the constitution disfavors "ex post facto" laws or rules), but the fact they have grandfathered in some employees who were together since before the rule does not give employees who were not in a relationship prior to the rule the right to argue that the rule is illegal or unfair because there are others it is not being applied to.
Now, if the company is applying the rule unequally to couples who are getting together after the rule is passed, then you might have a claim against the company only if you prove their application of the rule is based only on age/race/sex/disability (unlawful discrimination
These cases are very hard in an at will employment situation because the employers can have these types of rules and they cannot be challenged in court unless they are rules that discriminate on unlawful discrimination grounds. They are not telling you that you cannot get married, they are just telling you that if you choose to get married or live together both of you cannot remain employed there, so you are being given the right to choose (not a great choice, but choice just the same).
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