My ex has not paid a penny towards our dc since we split up seven years ago, he has been on a low income which is fair enough while I earned a wage.
During that time however he has had two huge tax rebates of more that a thousand pounds and offered nothing, I have asked him during these times for help with uniform for our dc but got nothing because "he needed it".
He has now just been given seven thousand pounds he was owed and is still insistant he needs it all.