I will like to know how quickly do you forget a painful loss and bounce back. I hate losing and after a big loss I will be frank I don’t forget it immediately although I don’t let it define my next game but it takes a while for me to forget a big loss and the best way I forget about a loss is how fast I can have a win in my subsequent games.
You can't. There's no easy and quick way. Accept that you are human after all, and you need to deal with your feelings lol.
Time will tell until you will realize that you have already moved beyond it.
If you can't deal with your big loss, then gambling is not for you. Better quit for good.