Ya pinky promise?

According to Nietzsche in The Genealogy of Morals, promises are discharging the will that nothing in time or space will stop a person from doing the duty. When people make promises then they are pretty much saying no matter what happens they will do whatever to make the promise happen. For example, if I promise my friend that we will have a movie night at my house but a tornado comes and destroys my house to where we cannot have the movie night then I am still breaking a promise. Even though I could not predict that the tornado was going to come, I still said no matter what we will have it. However, if I text my friend and said that we could not have it because I have to go eat dinner with my family then that is truly breaking a promise. I agree with Nietzsche because I have the freedom to choose to have the movie night but decided not to. That is testing my will as a slave, which shows that I am weak because I did not go through with the promise I made. On the other hand, I do not agree with Nietzsche in that I broke the promise to my friend because the tornado hit my house because I had no control over that. I do not think that people make promises meaning that nothing in time or space with stop them from doing but nothing in their control with stop them from doing it. I feel that breaking a promise due to a person choosing not to do it shows that a person is very weak not only because they did not do what they said but that it made their friend make a moral judgment on them. Therefore, that action will be held against them and could possible cause bad consequences. For example, in the future that friend may not trust you when you make other promises. Promises are to be held in the case that nothing in somebody’s control will stop them.