At first I screwed up my best friend's plan of getting a new girlfriend. By simply mentioning his name to his target. Then -it seems like- he is really mad at me that he never texted me again. Or even replied mine.
Then I made a promise to a senior that later on I could not fulfill. I promise to come to help them practice, but I got sick -my stomach is really killing me, even until now.
It might not be horrible, but it has something to do with level of trust. Though the first one was due to my cluelessness, and the second one was a force major.
Yet the world is cruel, and no one would care about your reasons.
All that matter is that, you made a mistake.