"Fuck excuses, learn to admit when you fuck up." This includes trusting the wrong people (and subjecting yourself to abuse). If you never admit you're involved, the same shit will happen to you, ad infinitum.
Ok, so maybe I would like this more if it said that people who treat you like shit get offended when you cut them out of your life. I don't treat people like shit just cause they did it to me, I just kick them to the curb.