Should I be paying child support?

Not nearly enough information.  For background, see the explanation and materials posted at http://www.willicklawgroup.com/child-support/.  But the essential questions are the current court order, if any, what changes have occurred and how much time has passed since that order was entered, and the facts on the ground as to how you could actually be "supplying him with everything he needs" while actually having custody half the week (since he undoubtedly eats, has a roof over his head, etc., during the other half of the week).  What you need, really, is a consultation with a family law specialist well versed in the subject.  Usually, with a clear understanding of the facts, and a copy of the relevant papers, the answer on child support questions is pretty easy to determine.