The promises humans make to their fellow humans is never guaranteed until we receive it to confirm and believe because majority of these promises have ended up as dissapointment which we need to avoid and reduce the mindset of putting hope. I have really learnt a lot from this kind of act where people promise without fulfilling and my major way of neglecting it to affect my mood is to never give up.
Sometimes some people just promise due to their mood and forget how the other person in need might feel. This is no fun neither is it appropriate to do so and if we know we can't fulfill what we promise, it is better to keep it to oneself. There are really people who volunteer to help when they promise and these are people who really want to help with their conscience to other people and they will do anything possible to fulfill it when they put such promise in mind.
Some people say "promise is a debt" which is really true because when you promise someone that you will actually give them a certain amount of money, you have indirectly decided to owe such people money because they never forced you for the promise but you volunteered and promise to do so. My advice to people in such situation is to avoid putting mind in such promise until it gets to you.
When you put in much hope in a particular promise, every of your mindset will be there because you feel if it eventually gets to you things would change a little. This is where everything will go wrong for you more if you put such promise into budget on how you want to utilize it. I have encountered several promises where the people who promise fail to fulfill and instead of me to feel bad I will still feel a 100% free and happy because I never put such hope in it.
There is a saying that "a bird at hand is far better of than 10 in the bush". This is true and we need to know and understand that without doubting or panicking. Humans are meant to fail and there are so many reasons why we can fail and one of those is that we are never perfect and we can say or predict what might happen in the next minute.
Avoid putting hope on promises if you really want to avoid having a bad mood and avoid seeing people as bad people. We are all in one way surrounded by promises but only the promise that gets to us is genuine. Some people failed promises might really not be their fault why some other people is deliberately but regardless of any of those promises never decide to rely on it to avoid regret.
Don't promise if you know you can't fulfill because you might be hurting other people feelings when you do so which you may not realize. Though their are situations that we can still remind them of their promises and during such time as well we can still be opportuned to know if they will fulfill it not but regardless of any we shouldn't put hope there to avoid breakdown of ourselves.