CHILD SUPPORT IS NOT CONDITIONAL

Bearing and rearing a child. 

The birth of a child is no more an accident for humans. This is a choice at least for educated lots in our society. Gone are the days when birth of child was God's  gift which is so if He has deprived either or both partners of that gift. 

Having said that, it is incumbent on both parents to rear their child born out of wedlock or adopted, to the best of their ability and capacity. This is an obligation. They are not obliging the child but themselves. This obligation travels to the time the child turns into an adult and is able to take care of himself. If for some unfortunate reasons he is disabled, parents' obligation does not end at his getting adulthood. 

And it is a joint responsibility which does not end at your ending the relationship by divorce or separation.

It is not a deal. It's not open to bargain. It is not like signing an agreement with the child that he will support you in your old age. That is his choice. Child support is a moral obligation not depending on child's service to parents- illegitimate or adopted.

Do not grumble if he is neglecting you or not supporting now when you need it the most.