I bet with a positive mindset, of course before I bet, but after I bet, I definitely don't have a positive mindset due to the tension. No matter how patient and positive a person is, they may be happy before placing a bet, but once the results of the bet are published, their mindset will definitely change, and if they lose, they will definitely be upset and will not be able to stay happy. Tension cannot be controlled after betting in gambling, tension comes automatically. However, it is true that if the result in gambling is positive, the mindset is positive and if it is negative, the mindset will definitely be negative.
This is not true for all cases, there are some match which you already know that the chances of your bet entering is very slim and so it’s likely to fail - if at the end of the game you check the results and found out that it didn’t go well, I’m pretty sure that you won’t feel bad about it because you’ve already prepared yourself and knew what was coming.
The only time I see someone being said about a bet is when, they are using money they won from a previous bet to re-bet again thinking that you can pull off the winning again only for you to lose it or when you had the chance to cash out like the bookie giving you the “cashout option” but instead you let it go only for the game to end and you ending up with nothing.