My live in Partner have a Gambling Problem

It's just for me to see him like this , he's doing online gambling like straight for 3-4days in our Room , and all the time he lose all the money and blame us , get mad at me and put all the blamed, saying mean words .

Then when he's already calm he's going to apologize and will make a promise that he will gonna stopped doing gambling. But then after days of resting he goes back again and doing the same routine. Frustrated, Angry, Mean. And He can't control his self anymore.

I really want to help him to be free on his gambling addiction, I encourage him to make a food business with me and we did but yet he's still doing it. I'm trying my best I put my full effort to make him better , to help him cause he's already drowning.
But you know I have this thought that "does he ever really change his self?" "Am I not doing my best to help him". Or should I stopped believing that one-day he's gonna change and make our life's better even his own life.

I really don't know what to do anymore at this moment we just have fight about All his savings that he lost on gambling today .
It's so stressedfull and I'm getting drained already . The things he does or the words he says to me every time he lose on gambling I can take it as my reason to leave him already, but I can't do it even somehow I'm losing myself too(I'm hurting my self physically and I'm starting to hate my self because I feel like everything I do for him is useless and I blame my self everytime he lose I feel like he's unlucky with me 😭)but yet I keep standing by Him cause I wanna see Him better and gambling free . I'm scared what he will do to his self if I left cause right now I'm the only person who believes and hoping that he will change.

Hope you guys can give me an insight about this , it's will really help me. . Thank you