We have some gamblers that win a lot and don't get trigger or upset over any gambling loss, they see it as normal process to win in gambling, you can't win money if you don't loss, it's impossible to achieve that unless you are cheating in the gambling or some sort of software which we both know that if the casino should find out about such behavior, your account is as good as gone and your money in that account will also be gone forever, just know that gambling loss don't make some unhappy.
Not every gambler can win a lot, many gamblers even lose a lot. 
The factors are varied. It can be skills, luck, experience, and other things.
However, it is true that win and lose are something usual in gambling. When we gamble there should be 2 result only, whether winning or losing.
People who understand the situation won't feel upset because they know a lose isn't very surprising in gambling. That's why they may limit the funds to avoid huge losses. But those gamblers who don't understand it, they may gamble with no limit of the funds. This finally can end up with a deep regret.
Anyway, I don't see a chance for common gamblers to cheat the gambling games. Most gambling sites have good security, they even update and strengthen the security constantly. So, kindly forget to cheat the gambling games!
I will say my situation is different on how I react to loss. I don't get sad any time I lose a game and what I do is that I remove my mind from any game I play because as they used to say it, too much expectations from a game is going to disappoint you, it's better you expect nothing to have surprised win later than get loss that you don't want to see at all.
It means you understand well about gambling nature. If you know it, you won't regret it because you know gambling isn't a place for expecting much for the result. That's why many people gambling is mostly about the luck. We can't expect much to win because we just rely on the luck. It is different with other things that don't rely on the luck only, such as trading or investment. In these 2 things, we can have a more expectation to end up with good results.