The AFPS like all other public sector schemes do not have any "fund" to support future payments. It is merely an obligation on the AFPS to pay future amounts at specified future dates. Once a share is implemented, then the pension credit benefits are totally separate from the scheme member''s benefits.
What happens is the pension is split . Your ex will get a lump sum (usually 25percent) based on his share when he decides to retire and depending on the terms and conditions of the pension you will be able to get a lump sum when you choice to collect the pension
The earlier you retire the smaller the pension you will receive