Hi swato,
Welcome to the forum and well done on taking a positive step and making it through Day 1. I would strongly recommend attending a new members group held on Mondays and Thursday if you have not previously done so, there you can get some great advice and tips including blockers you can put in place going forward.
You mentioned that your partner does not know you have a gambling addiction but the truth will have to come out soon.
While your partner finding out about your previous gambling is never going to be easy, from my experience, telling them yourself compared to them finding out on their own (which it sounds like is inevitable if you don’t tell them) will lead to a much better outcome for both you and her.
If you tell her first, that will allow you to be in control of being fully transparent, and honest, while also presenting the work that you are doing/have done to try and quit gambling such as 1)joining this forum, 2) Putting blockers in place such as closing existing accounts, software blockers etc, and ideas you have for how they can help if they want to continue on this journey with you such as taking sole control of the savings account at least in the short term.