I've been through the exact same thing with my XW. Throughout the separation, she made very bad financial decisions, not to mention trips to meet up with the OM. Foolishly, I offered to help her on several occasions as I loved her and felt like it was my duty as a husband to help her. I was feeding her 'cake-eating.'
They must see what it will be like for them to be totally on thier own, without you in thier life.
Formerly SGfan M:38 W:33 M:8 yrs T:10 yrs Bomb: Dec '08 Separated: 4/18/09 Divorce: 8/28/09 XW Affair began: April 08