Well done @thor for having the bravery to return to the group to take ownership of your situation. That shows you taking full accountability for your actions and is a great sign you have the awareness needed to understand what to do differently next time.
This is the exact same issue that I struggle with. This process has become a deeply ingrained pathway within our brains. It starts with something that seems relatively harmless, such as fantasising, but this is never enough because the cravings never get resolved. It just increases the need for more and more dopamine until we finally reach the point of no return and feel powerless to stop it.
Yesterday was my worst day for cravings. I was literally seconds away from giving in, but I've been working on a new technique to help cope during these moments.
When I feel like giving in to the intense cravings, instead, I consider a future moment that I want to save my sexual energy for that will feel much more rewarding.
For example, yesterday I was thinking that the following day I want to go into town and do some daygame. I'm trying to get better at interacting with women as a way to help overcome this addiction. Real-world connection over the virtual bullshit that is so unfulfilling.
So I thought to myself, 'If I relapse now, I won't have the sexual energy required to go and do daygame tomorrow,' and then the following day would be ruined.
It's about experiencing the feeling of future regret and bringing it into the present moment. Sacrificing the guaranteed instant gratification of today for the potential for a better tomorrow.
In that moment, my daygame session of tomorrow became more important then giving in to the cravings of today. So, even though the feelings were intense, I still managed to get through it, as I had a reason to hold on and save my energy.