Selfishness

I am really annoyed. Someone i trusted, who i relied on, who had made me a promise has let me down. I spoke to one of my friends about this, and i was right, it does seem trivial, which i why i won't give details. however, i feel he is being selfish, letting me down as he would rather do something else for fear of what will happen if he doesn't. Its not even like he is important to the other thing.
Maybe i am being selfish for wanting to deny his will, but you know what, i don't really care, i feel hurt by his attitude, and i will be angry about it if i want to be.
I delt with it in a bad way, i ended up telling him i didn't need him anyway and blocking him, hmm maybe i regret that, but i am not changing my mind and will pointedly ignore him for the foreseeable future. childish. yes, i am aware of this, but why shouldn't i be, i am only a child.
Very short post, i am not going to analyze selfishness, talk about other experiences, i will just ask, who considers themselves selfish? any stories of selfish people?
and a real genuine question, do you think i am selfish? because i never thought i was, but my reaction to this, maybe i am