Why did my father saw himself as a failure once?
Needless to say, my father found out about it and really thought that he failed. It hurt me to see him with the most disappointing expression ever. It tried explaining it wasn't his fault but he thought it was. It hurt me to see him sad that day.
That was enough for him, having to deal with making the one person that had a better expectation of me, who trusted me to do the right thing (that already assumed I was raised good) sad.