What’s done is done. Maybe you can repair the damage to your relationship caused by CG, I’m not the one to tell. However, I would advise you to first set up blockades to prevent you from acting on your gambling urges. Stopping the gambling has first priority and then you can focus on the relationship because you saw what it did to it.
The most common blockades are excluding yourself from any physical and online casino that you know of and If possible, give up control of your bank account to someone you can trust and get allowances from him/her.
I hope that once you have stopped the bleeding that you can work your way back to your boyfriend, it seemed like you had a good thing going there.
I wish you the best
– Chris