My child’s dad is pitiful

My child’s dad brought her a high chair. Afterwards, he asked me to pay him back half of the money for the high chair. He already doesn’t help out with anything. I can’t believe I made the stupid decision to have a child with him. I’m a college student, I work every single day and I take care of my child with no help and he has the nerve to ask for his money back. He also asks me for gas money whenever he comes to visit.