I've taken all of the steps to deal with my addiction, using gamstop to ban any gambling apps or sites from my phone and told my banks not to authorise any gambling transactions.
Sounds like all you have done is take the very first preliminary steps to start dealing with your addiction, not even close to “all the steps”. Have you joined Gamblers Anonymous? Do you have a sponsor? A recovery plan? A way to start making back the money you have gambled away?
I know it's all my fault but I want him to understand it is a serious addiction and it's not the real me I'm not a bad person.
If it is not the real you gambling, who is it? You are minimizing your addiction and your responsibility (most addicts do) and expecting him to fast forward to a place that you can only earn back slowly over years, if he wants to give you that chance.
He may not, of course. My ex had a hidden spending addiction, and it wasnt just the loss of the money that meant it was over forever for me as soon as I found out.
It was the realization/recognition of his deep selfishness, the many many lies told with a straight face and even gaslighting to make me think I was the one with issues, the things my children missed out on, the crankiness with me and the kids when he hadn’t had his fix, the defensiveness and evasiveness when talking about money, the dismissiveness when I expressed concern about how much stuff he had, the blame-shifting and implications that somehow his unhappiness with me caused his actions, the risk it posed to my financial future.
He too made all the big promises about how he’d hit rock bottom and although it was shameful for him, he was grateful it was all out in the open and he was going to be a changed man from that day on, he’d never go back to that dark place again…
Blah fucking blah. He was right back at it just a
couple of years on, plain as day to see, even though I keep him at arm’s length. Weakness is the primary characteristic of an addict. Either get honest with yourself about the reality of your choices and get serious about getting into and staying in recovery every day for the rest of your life, or you’ll ruin every relationship you ever have, including with your kids.