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If a gambler regrets his losses, it means he doesn't really understand the risks of gambling, because only a true gambler never regrets his losses because he knows that there is always a risk of losing in gambling, so for him losing money is not something to be regretted, nor is getting money from winning something. which must be expected too, because there is no point regretting something that has been lost.
Many people don't understand how to gamble properly, sometimes most of them still like to be greedy in betting, they always bet big money but in reality they never get the slightest win, that's why never gamble if you don't understand every risk because if you understand it then there will be no regrets when gamble even if you lose. just think of gambling for fun
In fact, regret is a natural condition that can happen to anyone, where someone regrets something or something afterwards. In gambling, we often experience this condition where at this stage someone regrets their actions. in the OP's case, he regrets risking all his winnings. The reason is, what he predicted did not match his expectations. Psychologically, this condition is very understandable and can happen to everyone, especially in cases of gambling.
However, what you say is actually not wrong. a gambler should know every risk he will take. There are only two choices, win or lose. it's just that in a position when we lose, our emotions of joy will quickly change to emotions of anger. It's natural to happen, even though we actually know all the risks of what we're risking. Usually, it is at this point where the gambler wants to make another deposit. the feeling of pleasure turns into anger, ultimately wanting to recover all the losses. Well, in this phase our understanding and self-control will be involved and tested.
For veteran gamblers, this situation can be very understandable even though there is resentment within themselves over their losses. However, for novice gamblers, this condition usually triggers a strong urge to carry out another gambling session under the pretext of recovering losses. So, for me this comes back to ourselves personally. If gambling is not fun, what's more, the situation is that we are overcome by the anger of defeat. Try to calm yourself down and think more rationally. stop, and come back another day when we are in a healthy state of mind.