Sometimes even after promising to stop, you can't really fullfill that promise because you might think that there's still a higher chance to win huge money and reach the jackpot but mostly that isn't the case. I too have experienced and it made regret my decision, i should have withdrawn when there's still a chance to earn good profit.
This is true especially when your surrounding people are still in gambling.
I used to say that I am going to quit gambling, but I was seeing all my friends go out and gamble in sports, so I had to do the same as they did - at least I was gambling with less money and I didn't suffer many losses.