Why sone gamblers can't accept their lose and get emotional whenever they lose is because they fail to gamble with what they can spare and it hurts them emotionally, next time instead using $100 he should go with something lower that won't make him emotional. As we gamble for fun or whatever reasons we should normalize doing things that won't mess up our mental health.
The clear thing is they lose control which makes them keep using more money and have a will to recover their losses. That will be difficult as they can spends too much, more than they can afford but they don't realize why they can easily using more money. We gamble for fun so we should know how to treat gambling and take care our control. You know when your emotion level increases so you can stops gambling and take a rest before the situation change.
You are right; when gamblers lose more than they can afford they tend to become emotional. After making the emotions get the better of them, many will begin chasing their losses and go on depositing more money to try to make it up to them quickly, which can cause even larger losses. Gambling is primarily a recreational activity. And not a guaranteed income-generating activity. Bankroll management and self-control are crucial for all gamblers. A brief rest from the losing streak also can help someone deflect the urge to make decisions through frustration or desperation.