(1) If the bonds of matrimony have been dissolved at the suit of the plaintiff spouse, the defendant spouse shall not be entitled to any part of the real or personal estate of the plaintiff spouse in case of such plaintiff's intestacy.
(2) Any entitlement a spouse may have to alimony shall be decided on the basis of factors set forth in § 36-5-121.
(3) However, when the cause of divorce is irreconcilable differences under § 36-4-103, subsection (a) shall not apply if the parties have entered into a written marital dissolution agreement wherein the plaintiff consents to the payment to the defendant of alimony, either in lump sum form or periodic payments; provided, that such marital dissolution agreement is approved by the court granting the decree of divorce.