Would you expect your baby daddy to help you out financially

I have two kids and have always struggled financially. My baby daddy and I have 50/50 custody. He has 3 other step kids and they all love in a big house. Since he technically has the kids more than me by like a day he doesn't have to pay child support. However I do think you should take care of your baby mama if you can afford it. I got a $400 parking ticket. I will admit it was my fault but this cops was being so shitty to me I needed to go into Walmart and get there quickly because my daughter needed her antibiotics for her strep. Closest parking was handicap. Ran in and ran out. A cop saw me parked there and told me to me my car. But he wasn't even kind about out. It was like "Unless your blind and shouldn't be driving anyway you clearly know that's handicap. Move your car!" It hurt my feelings and I've always had some issues with people belittling me. So I sat there and wouldn't move. He got out of his cop car and came up to my window. He asked did I not hear them. I got on my phone and ignored him and he wrote me a ticket. I felt stupid after that. I should have left instead of going on a power trip. I texted my baby daddy and he told me he was sorry about that. I asked if he could help me because he could afford it. He said no because Simon and Abby which are two of his step kids both need braces that he has to save for. If it was our kids or even biological kids he had with her, sure put her before me, but they aren't. I know we aren't together but I see other men still taking care of their baby mamas because it's better for the kids.