Is it wrong that I expect my ex to buy the essentials for my son and send them over with him?
Was a court order the cause of this?
there was no court involved, he just needs to learn the lesson.
Your ex is an ex, and you didn't mention if the child is his. You need to move on from your ex and not treat him as a bank, he is a human being. You can't expect him to support the kid if it may not be his, since there is no court order.
I don't give a fuck about my son and my ex. Take it up with the judge.
You and your child's father are equally responsible for your son. You should be able to purchase the things that are needed when he is with you. Your child's father should purchase what is needed when your son is with him.