I have child support orders in place in Colorado for my 3 children. My ex-husband changed the support orders without a court order or approval from me when one of the children reached legal age. I told him that he could change the orders but it needed to be done through the courts. Now he is claiming that I owe him for the months that he paid the full support amount. Can he just change the support amount without a court order? Is it possible that he could make me pay him back for months that he paid the full court ordered amount before he personally decided on a new amount?