I just need to vent!

I am 23 weeks pregnant I am being induced at 35 weeks. We literally have nothing for our son. I am working making minimum wage trying my best to keep up with my bills and buy things here and there for my son. Dammit I am trying. However my son's father is the most immature man on this planet. He hasn't bought absolutely anything for our son yet wants to spend 780 on some dolce diet to help him change his lifestyle. We got into an argument about that obviously since he is the one that makes most of the money. I told him that expense should not even be a discussion if he hasn't bought anything for his son. Why would he risk his son to go without for his selfish needs. I have tried explaining that life is no longer about him or me it's about our child yet he throws it in my face that I don't get the baby much because I make barely anything. Well yes that's true but the difference is that anything extra I have left after paying bills is spent on my baby no excuse. Why can't he understand that and stop being so naive and ignorant. Either way I will not allow my son going without even if I have to work  2 jobs. I know what matters most in life at this moment. I have washed my hands and I'm done not for me but for the sake of my son. He is my #1 priority and for the wellbeing of my child I will fight for full custody against his wishes I mean after all if he cared he wouldnt act like a senseless Moran right?