Hey I'm so sorry for what you are going through, it must be so scary to be so worried about money and also so disappointing that you can't trust your husband.
Just to add another perspective... I am a reformed gambler. At my peak I was spending around $1000 a day. I had some big wins but ultimately all gamblers lose, the addiction means you don't a op till you are forced to. Well, in most cases.
I blew about $100k of shared money.
Then I got myself to a gambling support group and also got individual therapy. I was shown how to get myself banned from casinos and I was also taught strategies such as changing my dentist because it was near the casino. I even quit my job so I was away from betting places.
At that time I was 33, I had a 2yo, a beautiful home and a great job.
I managed to break free of the addiction before it broke me - and is. Amazingly my husband was very understanding and supportive.
I have not gambled since (14years) and I budget with the finest.
Looking back I can see it was nothing to do with money and everything to do with escaping the nightmare I was enduring in my head. (I had been the victim of a serious crime and had undiagnosed PTSD) staring at the machines distracted me from the hell in my mind. I didn't really understand that at the time though.
So I think it is possible for your husband to recover but the motivation needs to come from him. And he needs to address whatever it is that's triggering the urge to gamble.
For you I wish very support and strength. Do what you have to do. X