For purposes of this subsection and unless otherwise agreed to in writing by the parties, "continued cohabitation" means the supported spouse resides with another person in a romantic relationship for a period of ninety or more consecutive days. The court may determine that a continued cohabitation exists if there is evidence that the supported spouse resides with another person in a romantic relationship for periods of less than ninety days and the two periodically separate in order to circumvent the ninety-day requirement.
S.C. Code § 20-3-130