Single mom needing advice about what to do

I am a single mom, I have one son. My boyfriend and I share an apartment. We share one car together. He keeps taking our money and spending it all in one sitting at the casino. I feel like he has no care for our son even though he is an amazing dad, who is hands on. He leaves us broke every single month with his gambling problem. We don’t have help from any of our parents and we watch our son without help. I just don’t know what to do. I don’t think I can keep living like this. And communication doesn’t really do anything, as I’ve tried to talk to him about our finances and what we need to do for our son. I have no one to vent to. I feel like I’m all in this by myself.