We consider your marriage ended when—

(a) Your spouse dies;

(b) Your divorce or annulment becomes final;

(c) We decide that either of you is not a spouse of the other for purposes of husband's or wife's social security insurance benefits, if we considered you married only because of § 416.1806(a)(2); or

(d) You and your spouse stop living together, if we considered you married only because of § 416.1806(a)(3).