Only people who are new to gamble and still dont understand what it means to be a gambler will stay long regretting over a loss. Its very easy for me to get over a loss because I know any money I bet with is open to either win or loss.
This is the first rule of gambling. Only gamble with money you can afford to lose, so no matter the amount you should not stay longer than a day reminiscing about a bet you lost.
It is good to forget about losing money that is not critical for the family budget. I remember the moment when I could not stop in time and started calling all my friends in a row to get them to lend me money to replenish the deposit. Some of them helped me, but after some time I disappointed them, because I could not return the funds on time. Their trust in me immediately dropped to zero. Of course, I gave the money back, but they still had a bad feeling. That is why I remember very well those losses that echoed for many years. I still remember them as something inappropriate.