Ex and I separated 4 years ago, we have 2 young children. He doesn't work, not that he can't, he just doesn't bother. 3 years ago I got a part time job, one day a week, 12 hour shift. Our children have autism which is why i can't work fulltime. We agreed that instead of paying maintenance he would look after them the day I work. Now he is saying I'm taking advantage of him and he is demanding I pay him. He still does not pay maintenance. Is this situation unfair (for him)?