Addicted to Casino

My boyfriend goes out to the casino and stays there for hrs gambling money, sometimes he wins & most of the time he losses. He gambles money away for the rent and then continues to go to the casino to “ get the money back “ I am frustrated because he’s so irresponsible. And he doesn’t care that he spends so much time there. That’s like his other home because he will literally spend 8-10 hrs at the casino, even when I ask him not too. I can’t tell him what to do because he doesn’t listen and he will do what he wants ... I’m frustrated and we are expecting a baby together .. I’m not sure if I should just leave him to get his attention or what I should do ...