I am not in this situation at all & hope like hell I never am.

But just wanted to say how sucky it is that a partner thinks all responsibility to his/her children is forfeited just because the relationship broke down. How sucky is that! I wonder how many out there actually still continue to go halves for raising their own children.
How can these people think its ok that they contribute nothing to the child they (assuming) once cared for & did everything for. People suck