Depends actually on the person itself sometimes if you're really addicted to it, you couldn't stop even after losing so much because there's always this "i have to get back what i loss mentality" but this is not generalization others could change. But i think the key thing to not become a compulsive gambler is to only bet money that is not important to you like savings.
Indeed. It depends to a person if he intends to stop playing gambling, even he keeps or tracks a record of his losses because there are gamblers who doesn't bother even his losses has already reach to millions of dollars because as long they gamble and they are still greedy to earn money they will probably gamble again.
Basically keeping a record of losses in gambling is not a way for gamblers to stop, because even losses or bankruptcy will not stop them from gambling. So in this case I think every gambler has his own way to stop and they won't stop gambling if they don't have the intention to stop.