Any married person who retires under the provisions of this act may elect in writing to reserve in the pension fund up to one hundred dollars per month from his monthly pension payments and said sum not to exceed one hundred dollars per month shall be payable to his surviving spouse after his death: Provided, That such person shall have been married to his spouse for not less than two years prior to the date of his death. Each surviving spouse shall be entitled to receive payments up to one hundred dollars per month commencing the first day of the month in which the death of the employe spouse occurred and shall terminate upon the death or remarriage of such surviving spouse: Provided, however, That in no case shall total payments to a member or his surviving spouse be less than the deceased member's contribution into the fund. In the event the spouse of a retired city employe shall predecease such employe, the employe shall revert to full pension payments for the remainder of his or her life.