There are two types of pain to deal with when gambling and losing.
1. The first one is the money you risk and lose.
2. When the money you almost win is very big.
It is certainly very painful when you are on the verge of a big win in gambling and then lose. That moment is very exciting and then there is a great joy of winning. When that joy goes in vain, it is very painful. It is easy to accept a loss after placing a bet in gambling, but it is much more difficult to accept a loss once it going to winning moment. However, when starting to gamble, it is important to remember that the money deposited for gambling can be lost at any time.
I also agree with you, if we expect a lot about something, but at the last moment if we do not get that thing, then this matter becomes much more sad for us. And we also know very well that nothing is guaranteed in gambling, so why would we go to expect too much where everything is uncertain? And gamblers do not want to understand this matter in any way, they should try to understand the reality, in sports the situation changes at any time, so we should never make any decision by expecting too much in such an unexpected place. Because this increases our disappointment, so we should not only think about winning but also be equally prepared for losing.