I think that a normal thing that happens to most gamblers. Getting greedy after the win because you have the money to spend. Although it is a mistake to do it, it can be correct if we do hit another win. Unless we keep on going and loses it all even though we are satisfied with the amount we won.
I had some wild stories but I don't really want to remember them. Many of them are too stressful to tell again and it's better if they are forgotten.
It's better to let them go, if they're painful to remember.
I think that greed makes us lose most of the times. Even if we have less chances of winning than losing, due to the house hedge alone, if we keep gambling after having won, we're maximising the chances of losing all (doesn't martingale work that way?). But, even if we withdraw, we'll end up making a new deposit another day, which is almost the same story.
There are two possibilities that make sense to me in such scenario: you can gamble small amounts in games with huge jackpots and quit forever if you win, or you can gamble or bet in normal games for the sake of fun but not looking for any profit. But in the moment you look into gambling as an investment, and get greedy, you're making a mistake.